West Marine Tubing SS 7/8''X20'. Bright 304 polished stainless steel or bright anodized aluminum. Used for a multitude of applications including grab rails, bow rails, and canvas top frames. Match materials between components to minimize corrosion. Stainless has .049" wall thickness Aluminum has .058" wall thickness Use 7/8" tubing for smaller powerboats Use 1" tubing for sailboats and larger powerboats Available in 6', 12' and 20' lengths Note: Aluminum is recommended for fresh water use only.