The Cole Hersee Push-Pull Switch SPDT On-On M-630 features a brass housing, three screw terminals, chrome-plated brass knob and 3/8" -32 thread, 1 1/4" (31.8mm) long brass mounting stem. Fits panels up to 1" (25.4mm) thick. It comes with brass facenut, washer and hexnut. Can be converted to On-Off switch by leaving one terminal unconnected. Marine construction.