Great, simple and effective way to nibble out access holes, panel fitting, dash boards, gauge holes ect.....Made of pressed steel with a hardended punch (replaceable), will become a valuable addition to your tool box. Capacity: 18 gauge Mild Steel (.047) (1.2 mm), 1/16" Aluminum (1.5 mm). Can begin in as little as a 7/16" diameter access hole. Made in USA