Kluson 19:1 ratio tuning machine. These state of the art, lightweight, diecast tuners are designed to directly retrofit the stamped F tuners that Fender uses on the reissue models that have the "70's style" off-set screw tuners fitted as standard. These will not fit original 1969 - 1979 instruments that have offset screw hole tuners. Uses the offset 2 screw mount with 10.5mm push in bushings - please ensure that your headstock holes are drilled out to 10.5mm diameter.  Installation may require some light peg hole clean-out with a reamer or round file. All mounting hardware is included. Newly upgraded with staggered post heights. Staggered posts negate the need for a traditional string tree. By eliminating the string tree, the break point created on the string before the nut is also removed; increasing string life, resonance and tuning stability. There are 3 string post heights included in this set (measured from baseplate to bottom of string slot): E and A string posts are 20mm long D and G string posts are 19mm longB and E strings posts are 18mm longString post diameter: 6mm