Graph Tech 3+3 Ratio Acoustic Guitar Machine Heads - Black, Mini Buttons

The PRN-2421 is a right-handed set of RATIO® calibrated machine heads for acoustic guitar that use 3 per side tuners. It has a two pin casing that can be used as is, or with the patented InvisoMatch Mounting Plates.

With RATIO®, a half-turn is a semi-tone. Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string.

4 different sets of InvisoMatch mounting plates in brushed aluminium 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
Button Style: Mini Contemporary
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: 0.083 lbs (38g)
Weight per set of six: 0.496 lbs (225g)
String diameter up to 72 gauge
Includes 6 machine heads, mounting screws and bushings
Includes complimentary 4 sets of aluminium mounting plates