Fits:   2-mile visibility for sail or powerboats under 20 meters (65.6 ft.) Meets ABYC Standard A-16. Clear lens. 12V DC - 6 CP lamp included. Flush 304 stainless steel with plastic body and socket. Rectangular 3-1/8" x 5-3/16" x 1/2" depth (7.94cm x 13.18cm x 1.27cm) Use #10 screws