VEVOR 1-1/2" Tubing Rolling Bender Manual Square & Rectangular Tube Bender 14 Gauge Roller Tubing Roller Flat Bar Bender For Mild Steel Cooper & AluminumPremium QualityThickened Screw RodLong HandleAdjustable RollerWell-Constructed BaseWide ApplicationRoller 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)