... round /rectangular /square pipes Specifications:1) Round pipes-Outside diameter (unit: mm)8,9.5,11,12,12 ... 60×60,70×70,80×803) Rectangular pipes: Outside dimensions (mm)20×10,23×11,24×12,25 ... : 600#, 400#, 320#,240#,180# etc.7) Tolerance: a) Outside diameter: ±0.15mm, b) Thickness: ±10% of wall thickness ... the receipt of deposit. stainless steel pipes,staircase round pipes,rectangular pipes,square pipes