Sea-Dog 78 Round Base Chrome Rail Fitting Constructed of chrome plated die cast zinc, these rail base fittings are recommended for freshwater use. These fittings install to deck with 10 fasteners not included. Fittings can be attached to railing with screws or can be pop riveted using stainless or aluminum rivets. For use with 78 OD stainless tubing with a wall thickness of .049. Die Cast Zinc Chrome Plated Available in 3 sizes Stainless Tube Wall Thickness .049 10 FH Fastener Dimensions S-D-286