... :20007)Application:Widely used in water supply, construction support, mechanical tube, etc.8)Export: Europe, North America, the Middle East, Africa ... territory, is a professional production of square tubes, rectangular tube, galvanized square tube processing, hot dip galvanized rectangular tubes, square tubes of ... a molding (not to pull out). Wall thickness 1.0-6.0.Square tube19*19 20*20 22*22 24*24 ...