LED Top Mount Side Navigation Lights are approved for USCG 2 NM (Colreg 2 mile). Includes port and starboard lights. Constructed of stamped 304 stainless steel with an investment cast 316 stainless steel base. Installs with four #8 RH fasteners (not included). IP67 waterproof rating. 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.