The Kluson Revolution F-Mount tuning machines allow you to upgrade your classic Fender with modern tuning technology. Designed for models from the CBS/Fender-era, these lightweight diecast tuners directly retrofit the original stamped tuners. With a 19:1 gear ratio, they provide rock-solid tuning stability for your Strat, Tele, or other vintage Fender. The locking Revolution tuners make restringing a breeze. Just flip up the knob on the backside of the tuner housing and feed the string through. No winding required. Once threaded, turn the knob to lock the string in place and trim off the excess. This saves you lots of time and effort when changing strings before a gig.