Erie Tools Manual Square Tube Pipe Roller Rolling Bender & Fabrication of Mild Steel Copper & Aluminum For use with mild steel, copper, and aluminum. For bending square tubes. Adjustable roller. Minimum Radius: 180 mm (20), 170 mm (25), 200 mm (30), 220 (40) Minimum Diameter: 450 mm (20), 500 mm (25), 550 mm (30), 600 (40)