[Sheet Metal Crimper Applicable Environment] Pipe Crimper are Suitable for Sizes 30 to 24 (0.41 to 0.71 mm) Galvanized Round Pipes and (0.31 to 0.61 mm) Black Furnace Pipes.No set-up or Adjustment. "Sheet Metal Crimp Drive Shaft has 50.8 N/mm Its Hardness and Super Toughness will not Break EasilyWe Upgraded the Duct Crimper Again. In Order to Reduce the Chance of Breaking, we Increased the Hardness of the Transmission Shaft, and Redesigned the Angle of the Gear tip to Disperse the Pressure at the Main Stress Points.Colour:BlackMaterial:MetalPackage Contents:1 * Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.