Manual Tube Roll Bender Square And Rectangular Mild Steel Copper Aluminum Pipe Premium Quality Thickened Screw Rod Long Handle Adjustable Roller Well-Constructed Base Wide Application Roller Adjustment: Manual,Copper (Metric): 20 x 20 x 1.5 mm, 25 x 25 x 1.5 mm, 30 x 30 x 1.75 mm, 40 x 40 x 1.75 mm,Mild Steel (Metric): 20 x 20 x 1.2 mm, 25 x 25 x 1.2 mm, 30 x 30 x 1.5 mm, 40 x 40 x 1.5 mm,Minimum Diameter (in): 17-3/4' (20), 20' (25), 22' (30), 24'(40),Aluminum (Metric): 20 x 20 x 1.75 mm, 25 x 25 x 1.7 5mm, 30 x 30 x 2 mm, 40 x 40 x 1.75 mm,Minimum Radius (in): 7' (20), 6-3/4'(25), 8'(30), 8-3/8'(40)