Check the listing for details. Kluson 3+3 Revolution Series G-Mount Tuners, Black. Condition: New. Listed at 69.51 USD. Kluson 3+3 Revolution Series G-Mount Tuners, Black Upgrade your classic keystone knobs WITHOUT drilling! The Kluson Revolution 19:1 high ratio G-Mount tuning machine. Kluson has truly introduced a game changer with the traditional footprint and newly designed sealed diecast housing. These state of the art tuning machines are designed to directly retrofit diecast tuning machines with a hex head bushing, traditional Kluson two-screw mounting pattern and modern 25/64 inch peghole. The vintage outline, metal keystone button and pin-stripes pay tribute to Kluson heritage while the brand new housing appearance incorporates all the features the modern guitarist demands. High gear ratio guarantees silky smooth operation, fine tuning stability with no backlash, all in a sealed one-piece housing! All mounting hardware is included. Specifications:19:1 gear ratio25/64" (10mm) peghole required1-3/32" overall string post height6mm string post diameterHex head screw-in bushing3 + 3 mounting patternSet of 6 includes all mounting hardware