This top of the line tuner is known as the Waffleback™ and has been absent from the market for 40 years. Kluson® is proud to reintroduce this tuner, which was used on numerous high end Gibson® Les Paul®s, ES-355®, Super 400, L5 and early Les Paul® SG Customs. important Dimensions:post diameter - 1/4 in. (.25 in.)set screw distance(on center) - 1 1/16 in. (1.065in.)housing width - 21/32 in. (.65 in.)housing length - 1 23/64 in. (1.35 in.)ferrule O.D. - 11/32 in. (.35 in.) Historically used on: 1962 - 1967 Gibson® Tal Farlow 1962 - 1968 Gibson® Dove 1962 - 1972 Gibson® Everly Brothers 1965 - 1968 Gibson® Heritage