These Gotoh Tuner Bolt Bushings are for their SG381, SG301 and SG360 series tuners and are handy spares for lost or damaged parts. They mount on the front of the headstock (screwing into the tuner body on the back of the headstock) to support the tuner post. The thin hexagonal nut portion of the bushing can become damaged if tightened with pliers instead of a socket wrench or spanner (do not overtighten the bushing). Please note these are for Gotoh SG series tuners with 10mm collars and we do not guarantee their fit to any other brand of machine heads. Priced per single bushing.