Ratio Tuned Machine Heads ~ Electric 6 in-line / 2 Pin Classic ~ OffsetRatio - Tuned Machine Heads are the first and only machine head to incorporate the different string gauges into the tuning equation. We balanced the individual gear ratios to each string dramatically simplified the tuning process. No more overshooting the G string or twisting away on the high E string. With Ratio, each half key turn equals one semitone change on all strings! Quicker, more accurate tuning on every string.

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A right handed set of Locking Ratio Tuned Machine Heads for electric guitar that use 3 per side tuners. Fits many Gibson, Epiphone style guitars and a lot of acoustic guitars if you want to upgrade to a locking set of machine heads. A two pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates. 4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes. You can upgrade to the matching finish InvisoMatch Plates 

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Set of Ratio Locking Tuned Machine Heads for an electric guitar that uses three a side tuners.  It has a vintage shaped button, has a two pin casing and is finished in black.

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Set of Ratio Locking Tuned Machine Heads for an electric guitar that uses three a side tuners.  It has a vintage shaped button, has a two pin casing and is finished in chrome.

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Set of Ratio Locking Tuned Machine Heads for an electric guitar that uses six in line tuners.  It has a classic shaped button, has a two pin casing and is finished in black.

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Set of Ratio Locking Tuned Machine Heads for an electric guitar that uses six in line tuners.  It has a classic shaped button, has a two pin casing and is finished in gold.

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The PRL-8731 are left-handed sets of Locking RATIO® Calibrated Machine Heads for electric guitars that use 6-in-line tuners. It has a two-pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates [opens in new tab]. 4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes. Gear ratio: unique for each string position - one turn-one tonePeg holes diameter required: 13/32" (10mm)String post diameter: 0.236" (6mm)String post length to string hole: 0.910” (23mm)Weight per single machine head: 0.083lbs (38g)Weight per set of six: 0.496lbs (225g)String diameter up to 72 gaugeIncludes 6 machine heads, mounting screws and bushingsIncludes complimentary 4 sets of aluminum mounting plates

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The PRL-8731 are left-handed sets of Locking RATIO® Calibrated Machine Heads for electric guitars that use 6-in-line tuners. It has a two-pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates [opens in new tab]. 4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes. Gear ratio: unique for each string position - one turn-one tonePeg holes diameter required: 13/32" (10mm)String post diameter: 0.236" (6mm)String post length to string hole: 0.910” (23mm)Weight per single machine head: 0.083lbs (38g)Weight per set of six: 0.496lbs (225g)String diameter up to 72 gaugeIncludes 6 machine heads, mounting screws and bushingsIncludes complimentary 4 sets of aluminum mounting plates

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The PRL-8731 are left-handed sets of Locking RATIO® Calibrated Machine Heads for electric guitars that use 6-in-line tuners. It has a two-pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates [opens in new tab]. 4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes. Gear ratio: unique for each string position - one turn-one tonePeg holes diameter required: 13/32" (10mm)String post diameter: 0.236" (6mm)String post length to string hole: 0.910” (23mm)Weight per single machine head: 0.083lbs (38g)Weight per set of six: 0.496lbs (225g)String diameter up to 72 gaugeIncludes 6 machine heads, mounting screws and bushingsIncludes complimentary 4 sets of aluminum mounting plates

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The PRL-8721 are left-handed sets of Locking RATIO® Calibrated Machine Heads for electric guitars that use 6-in-line tuners. It has a two-pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates [opens in new tab]. 4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes. Gear ratio: unique for each string position - one turn-one tonePeg holes diameter required: 13/32" (10mm)String post diameter: 0.236" (6mm)String post length to string hole: 0.910” (23mm)Weight per single machine head: 0.083lbs (38g)Weight per set of six: 0.496lbs (225g)String diameter up to 72 gaugeIncludes 6 machine heads, mounting screws and bushingsIncludes complimentary 4 sets of aluminum mounting plates

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The PRL-8721 and PRL-8731 are left-handed sets of Locking RATIO® Calibrated Machine Heads for electric guitars that use 6-in-line tuners. It has a two-pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates [opens in new tab]. 4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes. Gear ratio: unique for each string position - one turn-one tonePeg holes diameter required: 13/32" (10mm)String post diameter: 0.236" (6mm)String post length to string hole: 0.910” (23mm)Weight per single machine head: 0.083lbs (38g)Weight per set of six: 0.496lbs (225g)String diameter up to 72 gaugeIncludes 6 machine heads, mounting screws and bushingsIncludes complimentary 4 sets of aluminum mounting plates

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The PRL-8721-C7 is a right-handed set of Locking RATIO® Calibrated Machine Heads for electric guitars that use 7-in-line tuners.It has a two-pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates [opens in new tab].4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes. Gear ratio: unique for each string position - one turn-one tone
Peg holes diameter required: 13/32" (10mm)
String post diameter: 0.236" (6mm)
String post length to string hole: 0.910” (23mm)
Weight per single machine head: 0.083lbs (38g)
Weight per set: 0.581lbs (266g)
String diameter up to 72 gauge
Includes 7 machine heads, mounting screws, and bushings
Includes complimentary 4 sets of aluminum mounting plates RATIO® patented gear technologyRATIO® - Calibrated Machine Heads incorporate different string gauges into the tuning equation. From Low E to High E 39:1, 24:1, 20:1, 35:1, 20:1, 12:1. We balanced the gear ratios to each string simplifying the tuning process. With RATIO®, a half-turn is a semi-tone! Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string.

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The PRL-8721-C7 is a right-handed set of Locking RATIO® Calibrated Machine Heads for electric guitars that use 7-in-line tuners.It has a two-pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates [opens in new tab].4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes. Gear ratio: unique for each string position - one turn-one tone
Peg holes diameter required: 13/32" (10mm)
String post diameter: 0.236" (6mm)
String post length to string hole: 0.910” (23mm)
Weight per single machine head: 0.083lbs (38g)
Weight per set: 0.581lbs (266g)
String diameter up to 72 gauge
Includes 7 machine heads, mounting screws, and bushings
Includes complimentary 4 sets of aluminum mounting plates

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The PRL-8721-LB7 is a left-handed set of Locking RATIO® Calibrated Machine Heads for electric guitars that use 7-in-line tuners. It has a two-pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates [opens in new tab]. 4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes.  Gear ratio: unique for each string position - one turn-one tonePeg holes diameter required: 13/32" (10mm)String post diameter: 0.236" (6mm)String post length to string hole: 0.910” (23mm)Weight per single machine head: 0.083lbs (38g)Weight per set: 0.581lbs (266g)String diameter up to 72 gaugeIncludes 7 machine heads, mounting screws, and bushingsIncludes complimentary 4 sets of aluminum mounting plates

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The PRN-2321 is a right-handed set of RATIO® Calibrated Machine Heads for electric guitars that use 4 + 2 tuners. It has a two-pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates [opens in new tab]. 4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes. Gear ratio: unique for each string position - one turn-one tonePeg holes diameter required: 13/32" (10mm)String post diameter: 0.236" (6mm)String post length to string hole: 0.910” (23mm)Weight per single machine head: 0.066lbs (30g)Weight per set of six: 0.393lbs (179g)String diameter up to 72 gaugeIncludes 6 machine heads, mounting screws and bushingsIncludes complimentary 4 sets of aluminum mounting plates

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Set of Ratio Locking Tuned Machine Heads for an electric guitar that uses six in line tuners.  It has a contemporary mini shaped button, has a two pin casing and is finished in chrome.

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Set of Ratio Locking Tuned Machine Heads for an electric guitar that uses six in line tuners.  It has a contemporary mini shaped button, has a two pin casing and is finished in black.

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The PRN-3422 is a right-handed set of open-back RATIO® Calibrated Machine Heads for acoustic guitars that use 3+3 side tuners. It has a Butterbean button. 3+3 tuners set Ratio Tuned Machine Heads: The New Standard In Tuning Technology Gear ratio: unique for each string position - one turn-one tonePeg holes diameter required: 0.346" (8.8mm)String post diameter: 0.236" (6mm)String post length to string hole: 0.827"; (21mm)Weight per single machine head: 0.055lbs (25g)Weight per set of six: 0.331lbs (150g)String diameter up to 72 gaugeIncludes 6 machine heads, mounting screws, and bushings

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The PRN-3411 is a right-handed set of open-back RATIO® Calibrated Machine Heads for acoustic guitars that use 3+3 side tuners. It has an intricate skeletonized button and finish selection. Gear ratio: unique for each string position - one turn-one tonePeg holes diameter required: 0.346" (8.8mm)String post diameter: 0.236" (6mm)String post length to string hole: 0.827” (21mm)Weight per single machine head: 0.055lbs (25g)Weight per set of six: 0.331lbs (150g)String diameter up to 72 gaugeIncludes 6 machine heads, mounting screws and bushings

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The PRN-3411 is a right-handed set of open-back RATIO® Calibrated Machine Heads for acoustic guitars that use 3+3 side tuners. It has an intricate skeletonised button and finish selection.Gear ratio: unique for each string position - one turn-one tonePeg holes diameter required: 0.346" (8.8mm)String post diameter: 0.236" (6mm)String post length to string hole: 0.827” (21mm)Weight per single machine head: 0.055lbs (25g)Weight per set of six: 0.331lbs (150g)String diameter up to 72 gaugeIncludes 6 machine heads, mounting screws and bushings

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The PRN-3424 is the right-handed set of open RATIO® Calibrated Machine Heads for electric guitars that use 3+3 side tuners. Please note that GraphTech retro tuners are made to a vintage specification (for 11/32” peghead holes) and will not be a direct replacement for a modern tuner. Please check the specifications below. Gear ratio: unique for each string position - one turn-one tonePeg holes diameter required: 0.346" (8.8mm)String post diameter: 0.236" (6mm)String post length to string hole: 0.827” (21mm)Weight per single machine head: 0.055lbs (25g)Weight per set of six: 0.331lbs (150g)String diameter up to 72 gaugeIncludes 6 machine heads, mounting screws and bushings

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The PRT-952-214 is a set of 6 Ratio InvisoMatch standard installation plates, designed for easy installation of Ratio Tuned Machine Heads. It has a 45-degree screw hole mount. Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting holes for a fast, perfect Ratio Installation.

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The PRT-952-214 is a set of 6 Ratio InvisoMatch standard installation plates, designed for easy installation of Ratio Tuned Machine Heads. It has a 45-degree screw hole mount. Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting holes for a fast, perfect Ratio Installation.

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Set of Ratio InvisoMatch Premium Installation Plates, designed for easy installation of Ratio Tuned Machine Heads. It has 45 degree screw holes and is finished in aluminium.

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The PRT-952-214 individual plate is an InvisoMatch standard installation plate, designed for easy installation of Ratio Tuned Machine Heads. It has a 45-degree screw hole mount. Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting screw holes for a fast, perfect Ratio installation.

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The PRT-952-214 is a set of 6 Ratio InvisoMatch standard installation plates, designed for easy installation of Ratio Tuned Machine Heads. It has a 45-degree screw hole mount. Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting holes for a fast, perfect Ratio Installation.

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The PRT-952-214 individual plate is an InvisoMatch standard installation plate, designed for easy installation of Ratio Tuned Machine Heads. It has a 45-degree screw hole mount. Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting screw holes for a fast, perfect Ratio installation.

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The PRT-952-214 individual plate is an InvisoMatch standard installation plate, designed for easy installation of Ratio Tuned Machine Heads. It has a 45-degree screw hole mount. Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting screw holes for a fast, perfect Ratio installation.

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The PRT-952-214 individual plate is an InvisoMatch standard installation plate, designed for easy installation of Ratio Tuned Machine Heads. It has a 45-degree screw hole mount. Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting screw holes for a fast, perfect Ratio installation.

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Set of Ratio InvisoMatch Premium Installation Plates, designed for easy installation of Ratio Tuned Machine Heads. It has 90 degree screw holes and is finished in nickel.

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Set of Ratio InvisoMatch Premium Installation Plates, designed for easy installation of Ratio Tuned Machine Heads. It has 90 degree screw holes and is finished in aluminium.

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The PRT-952-216 is a set of 6 Ratio InvisoMatch standard installation plates, designed for easy installation of Ratio Tuned Machine Heads. It has a 90-degree screw hole mount. Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting holes for a fast, perfect Ratio Installation.

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The PRT-952-216 individual plate is an InvisoMatch standard installation plate, designed for easy installation of Ratio Tuned Machine Heads. It has a 90-degree screw hole mount. Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting screw holes for a fast, perfect Ratio installation.

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The PRT-952-216 is a set of 6 Ratio InvisoMatch standard installation plates, designed for easy installation of Ratio Tuned Machine Heads. It has a 90-degree screw hole mount. Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting holes for a fast, perfect Ratio Installation.

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The PRT-952-216 individual plate is an InvisoMatch standard installation plate, designed for easy installation of Ratio Tuned Machine Heads. It has a 90-degree screw hole mount. Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting screw holes for a fast, perfect Ratio installation.

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Set of Ratio InvisoMatch Premium Installation Plates, designed for easy installation of Ratio Tuned Machine Heads. It has 90 degree screw holes and is finished in gold.

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The PRT-952-216 individual plate is an InvisoMatch standard installation plate, designed for easy installation of Ratio Tuned Machine Heads. It has a 90-degree screw hole mount. Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting screw holes for a fast, perfect Ratio installation.

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The PRT-952-216 individual plate is an InvisoMatch standard installation plate, designed for easy installation of Ratio Tuned Machine Heads. It has a 90-degree screw hole mount. Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting screw holes for a fast, perfect Ratio installation.

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The PRT-952-201 individual plate is an InvisoMatch standard installation plate, designed for easy installation of Ratio Tuned Machine Heads. It has the modern F-Style two-pin mounting system (slightly larger than the Ratio two-pin mount). Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting screw holes for a fast, perfect Ratio installation.

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The PRT-952-201 individual plate is an InvisoMatch standard installation plate, designed for easy installation of Ratio Tuned Machine Heads. It has the modern F-Style two-pin mounting system (slightly larger than the Ratio two-pin mount). Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting screw holes for a fast, perfect Ratio installation.

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The PRT-952-201 individual plate is an InvisoMatch standard installation plate, designed for easy installation of Ratio Tuned Machine Heads. It has the modern F-Style two-pin mounting system (slightly larger than the Ratio two-pin mount). Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting screw holes for a fast, perfect Ratio installation.

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The PRT-952-201 individual plate is an InvisoMatch standard installation plate, designed for easy installation of Ratio Tuned Machine Heads. It has the modern F-Style two-pin mounting system (slightly larger than the Ratio two-pin mount). Match the correct plates to the current machine head screw position on your guitar. Use your guitar's existing mounting screw holes for a fast, perfect Ratio installation.

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