... , 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, 100*40, 100*50mmWall thickness: 0.3-3mmLength: 6mm (or ...