Punch up to a 4" conduit size hole in a maximum of 10 gauge mild steel. No hydraulic oil. 1/2" to 2" punches designed to split the slug into two pieces for easy removal. High strength steel punches and dies for long life. Recommended drill – (provided by end user) – 1/2" cordless drill with a minimum of 18 volts. Fast, easy punching – no ratcheting. Made in the USA.