Switchcraft 1/4 inch mono #11 input jack. Includes nut and washer. Requires 3/8"-diameter mounting hole; 3/8 x 32 threaded portion is 1/4 inch long. Industry standard in quality and design. Essential component in all electric guitar builds. We do guitar repairs on instruments, electronics, and do Plek work! • MFSKU EP-0055-000 • UPC 645208040467