Panel mount toggle switch. 1-pole, 1-throw on/off. Applicable for lights, bilge blower, bilge pumps and accessories. Built-up pilot light (red) for night vision. Fits panel up to 1/4 inch thick when not using the back-up nut provided, fits panels up to 3/16 inch thick when using the back-up nut. Requires a 1/2 inch mounting hole.