RATIO® patented gear technology
RATIO® - Calibrated Machine Heads incorporate different string gauges into the tuning equation.

From Low B to High E 48:1, 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.

Features

• The PRL-8621 is a right-handed set of Locking RATIO® Calibrated Machine Heads for electric guitars that use a 3 x 4 tuner configuration.
• Fits many Jackson, Schecter, and Ibanez (selected) style guitars and a lot of acoustic guitars if you want to upgrade to a locking set of machine heads.
• 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.

Specifications

• 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