... : Size Range:1) Round pipe diameter: 16mm-610mm, thickness: 0.8-20.0mm2) Square tube: 16 x 16mm-400 x ... 400mm, thickness: 0.8-20.0mm3) Rectangle tube: 19 x 10mm-500 x ... 300mm, thickness: 0.8-20.0mmB: Surface finish: black, blank, bright and ... K-55,N-80OD:4.5"-13.375"W.T.:0.205"-0.514"Length:R1,R2,R3Thread:Plain end,STC,BTC,LTCWe ...