attwood Bi-Color Combination, Deck Mount Navigation Light Each light provides two-mile, 112.5light visibility Smooth contour prevents lines from snagging on housing. Available in a variety of finishes Single external stainless steel lock screw attaches cover to base, permits easy disassembly for servicing Stainless steel electrical contacts will not corrode Attaches directly to deck with concealed #10 fasteners- or to one of the sidelight snap-on bases