... ,133,141,159,2192) Square pipe-Outside diameter (unit: mm)10×10,12×12,15×15,17×17,18×18,19×19 ... ,70×70,80×803) Rectangular pipes: Outside dimensions (mm)20×10,23×11,24×12,25×13,30×30,36×36 ... ,48×48,50×50,60×60,70×70, 80×804) Wall thickness: from 0.3 to 3.0mm5) Length: 6m(or ... .7) Tolerance: a) Outside diameter: ±0.15mm, b) Thickness: ±10% of wall thickness, c) Length: ±4.5-0mm8) Outer size can be ...