Sea-Dog Stainless Steel Rectangular Transom LightStainless Steel Rectangular Transom Light Rectangular Transom Light is constructed of stamped 304 stainless steel. For replacement of existing lighting (not for new construction). Installs with two #10 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.