This set of 6 in line Gotoh SD91 tuners are in the traditional Kluson design used on vintage Fender guitars (and used by and sold under the Fender name for their re-issue guitars). The press fit bushing fits a 11/32" hole (8.8 mm) in the headstock to secure the string post, and the Nickel and Gold versions (NOT the relic version) also come with a 9.2 mm diameter bushing to fit slightly wider headstock post holes.