Hopkins Towing Solutions 4 Round Stop-Tail-Turn Lamp Flange Mount B430BLK light is designed to conform to applicable U.S. FMVSS108 and Canadian CMVSS safety standards. The light is surrounded by a replaceable acrylic lens steel housing and includes a double lead wire. The recessed light and requires a 4.5 diameter cut out for installation. The Hopkins Towing Solutions 4 Round Stop-Tail-Turn Lamp Flange Mount B430BLK light works with 12 V systems. Replace default bulb with any standard #2057 incandescent.