Check the listing for details. StewMac Threaded Endpin Jack. Color: Gray, Size: 18, Condition: New, Style Code: GW4654. Listed at 33.24 USD. This is a top quality 1/4" jack that can be wired for mono or stereo. Easily tightens from the outside. That's pretty convenient when you can't get your hand in the instrument, especially on ukes! Wiring info: Tip (positive) is shortest terminal Ring (stereo output or battery switch) is mid-length terminal Ground is the long terminal coming off the side of the jack Dimensions: Overall length: 1-13/16" (46.04mm) Threaded portion: 1-1/8" (28.58mm) Thread: 9/16-12 Diameter: .556" (14.12mm) Installation tip: Use a tap to cut 9/16-12 wood threads in the tailblock, which will fit the jack perfectly. A 1/2" starter hole is required — get one with our Endpin Jack Reamer (sold separately).This is a top quality 1/4" threaded endpin jack that can be wired for mono or stereoEasily tightens from the outsideThe tip (positive) is shortest terminal, the ring (stereo output or battery switch) is mid-length terminal, and ground is the long terminal coming off the side of the jackOverall length: 1-13/16" (46.04mm); threaded portion: 1-1/8" (28.58mm); thread: 9/16-12; diameter: .556" (14.12mm)