USCG certified for two-mile visibility for sailboats and powerboats up to 39' (12 m). Classic style. Housing is made from rigid polycarbonate that is shock resistant, non-corrosive, non-magnetic, and seawater resistant. Mast Mount. Dimensions: 2.95" Height, 2.4" diameter. Includes 10-watt/ 12-volt convex festoon bulb, replacement PN 90203-7. For bulb replacement for fixture prior to June, 2010, use concave festoon replacement bulb PN 90200-7.