A dependable source of bright illumination for the cockpit or the foredeck. Doubles as a bright, USCG-approved masthead light for nighttime boating. Vertical surface mount for sailboats and powerboats. USCG 2nm lamp good for boats up to 12m (39.4'). 7-1/2"L x 5-1/4"W x 2-7/8"D.