Circle D Lights, portable and permanently mounted fixtures that are weatherproof, corrosion and shock resistant. Heavy wall cast aluminum alloy housing construction (A356.2 Aerospace quality) with stainless steel hardware used thoughout. Products include a patented, double cushioned spring mounted socket and a resilient ring rim gasket, which holds lamp tight and keeps out dirt and moisture. Approved by the U.S. Coast Guard and UL listed. Portable power distribution outlet / junction boxes, and mounting accessories as well.