VEVOR CH-60 Hydraulic Hole Punching Tool 31T Hole Digger Force Puncher Smooth Hole Puncher for Iron Plate Copper Bar Aluminum Stainless SteelProduct Features Excellent Punching Punching force: 31T 310KN; Depth of throat: 3. 74" 95 mm. The punch dies are made of high carbon tungsten steel and not easy to wear off. The max thickness of iron plate: 1 10" to 3 10" (3 8 mm), the max thickness of copper aluminum bar: 1 10" to 2 5"(3 10 mm), the max thickness of stainless steel: 1 10" to 1 5"(3 6 mm). 4 Pairs of Dies The hydraulic puncher comes with four pairs of punching dies of 3 8"(10. 5 mm),