"Protect bulbs and contacts when trailer is under water. Gasketed tail light and side marker lenses are easily replaceable. Closed bottom design prevents road grit from entering lamp. Comes with 12" pre-installed wire leads and two 1/4" mounting studs on 2" centers. Includes built-in rear clearance light. Easily mounted on most standard tail light brackets. 6.29" x 4.66" x 3.76" overall height."