Running 220V service in the shop for your 50-lb. power hammer sounds plenty reasonable. Installing the line without properly insulated tools, not so much. This German-engineered driver set from Wera is individually tested and guaranteed safe up to 1000V. Set includes four slotted (3/32", 9/64", 5/32", 7/32") and two Phillips (PH1, PH2) blades that lock securely into the included handle. Non-rolling hexagon design. Includes tough nylon roll-up carry case.