CH-70 Hydraulic Hole Punching 35T Tool Puncher. This CH-70 hydraulic hole can apply to L and H style flat copper and busbar. The end of the puncher is designed with flat seat, smooth but not fall. What's more, punch dies are made of high carbon tungsten steel and not easy to wear off. Pumps of model CFP-800-1 , CP-700 , etc. Or electric pump can be connected. It is used for punching for metal plate. It is popular in electricity industry, construction, etc. Apply to L and H style flat copper and busbar. The end designed with flat seat, smooth and not fall. With punch dies ...