1.Stainless steel pipes and tubes,ROUND,SQUARE,RECTANGULAR IN 201,304 grade 2.special for stairs,handrails, ... Application : decoration,industrial,etc Standard: ASTM A554,GB,etc Shape: Round,Square,Rectangular, emboss and spiral pipe Material: 201,304,etcOut diameter ... :Round:9.5-133mm,Square:10x10--80x80mmRectangular:10x20-45x95mmThickness: 0.25-2.0mm. ...