Genuine Switchcraft standard 1/4" guitar input jack with extra long threaded bushing, open circuit type. Threaded portion of bushing measures .375" (3/8") overall length. Fits most old American guitars like SG, many semi-hollow models, etc. Also used for speaker output, etc. on old guitar amps. 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 lock washer, nickel plated beauty washer and nickel plated hex nut. Brand New. Genuine Switchcraft.