A small push button style momentary switch. Great to engage your starter motor through a relay, but because it is a "normally open" and a "normally closed" switch, it can be used for a lot more functions. Push button is stainless steel with a .845" (22mm) diameter polished bezel and polished button. Switch is 1 1/4" (32mm) long. Fits in a 3/4" (19mm) hole and comes complete with nut.