The 1MS4T1B1M1QE is a single-pole double-throw (SPDT) miniature Toggle Switch with solder lug termination, Momentary-OFF-Momentary function, 10.41-inch high chrome plated brass actuator, 8.89-inch high keyway (THD standard) nickel plated brass bushing. The 1MS4 series switch has silver plated contact, stainless steel housing and tin plated brass switch support.