Constructed of chrome plated die cast zinc these rail base fittings are recommended for freshwater use. Installs to deck with #10 FH fasteners (not included). Fittings can be attached to railing with set screws or can be pop riveted using stainless or aluminum rivets. Set screws included with display packed fittings only. Set screws can be purchased separately (299999-1) for bulk fittings. For use with 7/8” OD stainless tubing with a wall thickness of .049".