Includes Switchcraft open frame mono two conductor jack with .375" long threaded bushing. Hardware kit includes nickel plated lock washer, nickel plated beauty washer, nickel plated hex nut, gold plated beauty washer and gold plated hex nut. Two conductor 1/4" open frame jack fits your old or reissue USA Gretsch exactly. 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. Brand New. Genuine Gretsch 9221010000. UPC 717669274672.