Genuine Kluson 3x3 nickel finish vintage style tuning machines with metal tulip shaped buttons. "Kluson Deluxe" is stamped onto the metal case in a single line down the center. Mounting screws are 15/16" on center. Post length 15/16". Post diameter 1/4"(6.3mm). Includes press-in bushings and mounting screws. Requires 9mm(11/32") peghead holes.