Meets CE and USCG requirements for 1NM visibility for sail or powerboats under 39ft. Meets ABYC A-16 requirements. Meets NMMA Certification Procedure.; 12V DC - 8 CP lamp included. Predrilled with two countersunk holes to accommodate no.4 screws. Housing is chrome plated brass with black plastic base. Size: 2-3/8in. OD base x 7/8in. vertical height.