... /square pipes Specifications:1) Round pipes-Outside diameter (unit: mm)8,9.5,11,12,12.7,14.5,15.9 ... ,17,18,19,20,22,23,28,29,31.8,35,36,38,45,47,48,50.8,60,63,46,88.9 ... ×22,23×23,24×24,25×25,28×28,30×30,36×36,38×38,40×40,48×48,50×50,60×60,70 ... ,24×12,25×13,30×30,36×36,38×38,40×40,48×48,50×50,60×60,70×70, 80×804 ...