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: 1968 - 1975 Gibson ES-355 1968 - 1971 Gibson Crest Gold 1968 - 1975 Gibson Les Paul Custom 1963 Gibson Les Paul / SG Custom 1964 - 1975 Gibson SG Custom