Side Mount Lights are constructed of stamped 304 stainless steel. One pair includes port and starboard lights. For replacement of existing lighting (not for new construction). Installs with six #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.