Switchcraft SC-157 endpin jack

Switchcraft #157 6,3mm (1/4 inch) Mono, 2 Conductor, Thick Panel Mount Jack with Cable Clamp. Nickel finish. Comes with Nut and Washer. Strap holder end pin jack.

1/4" STRAP NUT END-PIN JACKS offer the same trusted quality of a Switchcraft end-pin jack, plus the added functionality of a removable strap nut.
This is ideal for acoustic guitar applications, eliminating the need to drill a second hole into the instrument for an output jack. The included handle and cable clamp ensure critical connections are protected, perfect for both OEM pickups or customizations. All hardware is included for easy installation.
This design has been available as an OEM special order for decades and is now being released as a standard product for the first time.