LED Fixed Mount All Around Lights are approved for USCG 2NM (Colreg 2 mile). Constructed of injection molded nylon and aluminum. Installs with two #8 FH 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.