One Switchcraft 1/4" standard amp input jack with extra long threaded bushing, female shorting type. Threaded portion of bushing measures .375" (3/8") overall length. Two conductor with tip shunt 1/4" open frame jack fits most old American guitar amps requiring an extra long bushing length. This jack mates with standard 1/4" phone plugs and mounts in a single 3/8" diameter hole. 3/8-32 UNEF-2A threads. I measured .370" diameter on the threads. We include a full set of mounting hardware; nickel plated lockwasher, nickel plated beauty washer, nickel plated hex nut.