These lights are ideal for boat and PWC trailers less than so· 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. 75" overall height.