Genuine Switchcraft premium 1/4" open frame guitar input jack, also used on vintage Fender amps for speaker output, etc. Open circuit two conductor type. Improved Mil. Spec. version. Fits all American Fender guitars and amps exactly. A fine upgrade; much better contact integrity that the cheap input jacks found in most new guitars and 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. Threaded portion of bushing measures .275" long. We include a complete set of mounting hardware; nickel plated lock washer, nickel plated beauty washer and nickel plated hex nut. Brand New. Genuine Switchcraft. Made In USA.