... : 10*10mm, 12*12mm, 15*15mm, 19*19mm, 22*22mm, 25*25mm, 30*30mm, 38*38mm, 40*40mm, 50*50mm ... , 60*60mm, 80*80mmRectangular pipe specification: 15*10, 20*10, 25*10, 25*13, 30*15, 32 ... *16, 40*20,38*25, 50*25, 75 ... *45, 60*30, 60*40, 95*45, ...