Stainless Steel Stern Light135° Stern Light is constructed of stamped 304 stainless steel. For replacement of existing lighting (not for new construction). Installs with three #4 RH fasteners (not included).All USCG approved navigation lights must be mounted properly to provide the correct visual alignment and allow unimpeded sight lines. Please refer to USCG regulations for 1 NM and 2 NM navigation lights for more information.