Replaces existing lighting (not for new construction). Constructed of stamped 304 stainless steel. Requires two #10 FH fasteners. These navigation lights do not meet the USCG 33 CFR 183.810/ABYC standard A-16 from 2016, but do meet the USCG 33 CFR/ABYC A-16 from 1997. A 4-13/16" B 3" C 11/16" D 3-1/4" Volts 12