These lights are ideal for boat and PWC trailers less than 80\" wide. Fully gasketed, screw on main and side marker lens allow for easy bulb replacement. Universal 2\" on-center stud mount. Meet FMVSS/CMVSS 108 requirements for trailers under 80\" wide when properly mounted. Prewired for easy installation. 5.25\" x 4.66\" x 3.76\" overall height.