... ,11,12,12.7,14.5,15.9,17,18,19,20,22,23,28,29,31.8,35,36,38 ... ,46,88.9,102,114,133,141,159,2192)Square pipe-Outside diameter(unit:mm)10×10,12×12,15×15 ... ,17×17,18×18,19×19,20×20,22×22,23×23,24×24,25×25 ... wall thickness c)length:±4.5-0mm8)Oter size can be manufactured according to requirements round pipe stanless steel material