Momentary kill switch. S.P.S.T. normally-closed, momentary push-button. Press to use, release to return. 0.51" diameter red plunger, 0.74" diameter metal bezel. 0.62" diameter threaded bushing mounts in panels up to 0.15" thick. Solder lug terminals attached.
Should first be grounded and then installed in hot wire to jack. Even though there is no terminal for grounding, you must still ground the switch. See image for wiring example.