Normally off. S.P.S.T. Two positions: off - momentary on. On with button depressed. Spring return to off. Silver contacts. Molded plastic insulator with a protective barrier between terminals. Mounting stem 5/8"-32 diameter, 1-3/8" long. Fits panels up through 1" thick. Includes 407-03 black moisture repellent rubber button cover. Pkg. Retail