Hollow Stainless Steel 3/4". Standard hollow stainless steel type 304 listed at $3.25/ft. Higher grade hollow stainless steel 3/4" type 316 listed at $4/ft.
STA2416H: 3/4" Hollow Stainless Steel
Stainless steel type 304 contains 18% chromium and 8% nickel while 316 contains 16% chromium, 10% nickel and 2% molybdenum. The molybdenum is added to help resist corrosion to chlorides (like sea water and de-icing salts). If your boat is often used in salt water, we always recommend using type 316.