Used on support equipment b-52,t-38,f-106,f-16,t-37,c-5,f-15,f-5,f100-pw engine. 1.344" overall length 1.625" overall width body 1:moving contact 2:stationart contact 4, two no. 6/0.138 in./-32 screws on irregular mtg centers, weapom system essential