????????????? Stainless Steel Square Pipe????????????? 3/8 ???? / ????????????? 1/2 ???? / ????????????? 5/8 ???? / ????????????? 3/4 ???? / ????????????? 7/8 ???? / ????????????? 1 ???? / ????????????? 1 1/4 ???? / ????????????? 1 1/2 ???? / ????????????? 2 ???? / ????????????? 2 1/2 ???? / ????????????? 3 ???? / ????????????? 4 ???? / ???????????