Kluson? 3 Per Side Revolution Series G-Mount Tuning MachinesThe 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.