Long Threaded Barrel Input Jack, Stereo, Black, Switchcraft, with Nut and Washer. Accepts 1/4" plug, and can be wired mono or stereo. 1/2"-diameter mounting hole,needed and at least 7/16" wood thickness are required for mounting. Overall length 2". Short post is hot, medium post is for battery, and larger outermost post is for ground. (H)