Graph Tech Ratio PRL-9721-C0 Locking Calibrated Machine Heads - 6-in-line Chrome

$136.80 $160.94
Maximum quantity available reached.

Sku: 702727000942
Brand: Graph Tech
GraphTech 6-In-Line Ratio Electric Locking Machine Heads Staggered Posts - Chrome (PRL-9721-C0)

RATIO patented gear technology

RATIO - 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. They 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.

The PRL-9721 is a right-handed set of Locking RATIO Calibrated Machine Heads for electric guitar that use 6-in-line tuners with staggered posts (eliminates the need for a string tree). It has 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.

6-in-line tuners set Staggered tuners set Ratio Tuned Machine Heads: The New Standard In Tuning Technology


• 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: 0.827” (21mm) - 0.787" (20mm) - 0.748" (19mm)
• Weight per single machine head: 0.083lbs (38g)
• Weight per set of six: 0.496lbs (225g)
• String diameter up to 72 gauge
• Includes 6 machine heads, mounting screws and bushings
• Includes complimentary 4 sets of aluminum mounting plates