Key Features High Efficiency: The maximum hydraulic output of the hydraulic knockout punch is up to 8T. This allows for fast and efficient hole punching work. Quality Material: The hydraulic pump is made of high-quality steel with a plastic-coated surface, which is robust, durable, and rust-proof. Easy to Use: With the opening head and the hydraulic pump working well together and swinging the control handle, you can easily get a clean and smooth hole with great ease. High Performance: The punching die is made of high hardness steel Cr40 for durability and sharpness.It can easily open holes in soft steel sheets up to 3mm/0.12" thick. 6 Optional Dies: It comes with 6 sizes of punching dies for different hole diameters so that you can freely choose according to your needs. Application This hydraulic knockout punch set has various cutting dies fitting many materials like aluminum, steel, and plastic. It works without scratching the surface of workpieces and is widely used in metallurgy, petrol, electrical appliance, ship, machinery and so on.It is suitable for soft iron sheets within 3 mm/0.12" and stainless steel sheets within 1.2 mm/0.047". How to Operate 1. Use an electric drill to punch a workpiece to make a guide hole before using the hydraulic hole punch. 2. Whirl the pulling rod into the screw of the piston cylinder, then ring the rod with a gasket and pass through the lower cutting die with the rod. 3.Put the pulling rod into the guide hole, and whirl the upper cutting die through the rod to make the upper cutting die, workpiece, and the lower cutting die connected tightly. 4.Shut the spill valve clockwise, and then press down the hand lever repeatedly to make the piston pump work.When the oil pressure climbs and the shear force between the cutting die increases, the die is starting to punch until it finishes.After punching, the hand lever must be stopped pressing down immediately. 5.Lose the spill valve anticlockwise to release the oil pressure. 6.After punching, the punch kit should be detached to clean thoroughly. Specification Model: SYK-8B Material: Steel Surface Treatment: Plastic-coated Punching Die Material: Steel Cr40 Operating Method: Manual Tonnage: 8T Punching Capacity: Soft Iron Plate within 3mm/0.12in; Stainless Steel Plate within 1.2mm/0.047in in thicknesses Dies Diameter: 22mm/0.86in, 27.5mm/1.08in, 34mm/1.34in, 43mm/1.69in, 49mm/1.93in, 60mm/2.36in Weight: 10.4kg/22.92lbs Package Size: 42*27*13cm/16.53*10.63*5.12in Package Included 1 x Hydraulic Knockout Punch 1 x Small-size Pulling Rod 1 x Big-size Pulling Rod ( for 8 Ton ) 2 x Gaskets 1 x Hose 6 x Cutting Dies 1 x Carrying Toolbox 1 x Manual