... offer, best prices and good quality Different choices: round /rectangular /square pipes Specifications:1) Round pipes-Outside diameter (unit: mm)8 ... ,63,46,88.9,102,114,133,141,159,2192) Square pipe-Outside diameter (unit: mm)10×10,12×12,15 ... ,18×18,19×19,20×20,22×22,23×23,24×24,25×25,28×28,30×30,36×36,38×38 ... ×803) Rectangular pipes: Outside dimensions (mm)20×10,23×11,24×12,25×13,30×30,36×36,38×38,40 ...