Hollow 1" Stainless Steel Standard type 304 listed at $4.25/ft. Higher grade type 316 listed at $5/ft. Sold in 16' lengths only.
STA3216H: 1" Hollow Stainless Steel Trim
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.