Optimized Design 10-Guage Mild Steel Knockout Punch Set With Black Finish, This Punch Set can punch clean and accurate holes in electrical panels. The 1/2-Inch Knockout Punch 3-Piece set can cut up to 10-gauge mild steel. It can also cut through aluminum, fiberglass, and plastic. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857. Punch Set optimized design reduces wrench effort Slugs are split inside for easy removal Maximum capacity of 10 gauge mild steel Also cuts aluminum, fiberglass and plastic Punches holes cleanly and accurately Set includes 1/2-Inch (13 mm) punch and die with 3/8-Inch (9.5 mm) draw stud