Product parameter Model: SKY-15A Output: 15T Maximum stroke: 22 Maximum thickness of stainless steel: 2mm, iron plate: 4mm Opening range: diameter 16-51mm Equipped with dies: Diameter: 16/20 / 26.2 / 32.6 / 39 / 51mm Weight: 13kg Advantages of This Product: The hydraulic hole opener has been tested for thousands of times, and the perforation will never damage the surface of the product. Efficiently increase productivity with the easy-to-use CP-180 pump. Made of high quality 40 chrome steel for durability and sharp opening. Use instruction First open the guide hole with a diameter of 20.5mm Step 1: Prepare an iron plate with a thickness of less than 4mm, and the stainless steel plate is preferably within 2mm; Step 2: Screw the big rod into the opening of the hole opener; Step 3: Install the lower die, iron plate, and upper die in sequence (the big rod does not need to screw the lock cap); Step 4: While pulling the lever, the die is also cutting downward; Step 5: While taking out the workpiece, the die is also cutting down.