Product DescriptionGreenlee proudly employs the United States workforce in seven manufacturing facilities, where we design, assemble and manufacture certain products which meet the rigorous made in the USA or qualifying statements. We encourage consumers to consult our product packaging or marketing materials found on greenlee to understand the origin of particular products.From the ManufacturerGreenlee Slug-Busters can be used on mild steel up through 10 gauge (3.5 mm). Application: Punch mild steel, aluminum, fiberglass and plastic. Operates with battery, hydraulic, ratchet or manual drivers.