Check the listing for details. KLUSON REVOLUTION LOCKING TUNERS 3+3 20:1 RATIO, CHROME KREL-3-C. Color: Chrome, Condition: New. Listed at 77.00 USD. These Tuners are a brand-new line from Kluson and if you have Grovers (102 and 502 Series) on your Guitar, these are a huge upgrade. Kluson's new Revolution E-mount tuning machines are die-cast construction and have the brand new 20:1 gear ratio. This all-new Kluson design incorporates today’s standard 10mm peghole mounting with a single screw at 6 O'clock low in conjunction with screw-in bushing and washer. Kluson designed this new tuning machine type to fit many of the electric and acoustic instruments manufactured post 1970, giving you the option in many cases for a non-modification required upgrade in both performance and appearance. This new Revolution E-mount tuning machine set is available in black, chrome, gold and nickel finishes and all mounting hardware needed is included. All colors in stock.