Introducing the upgraded Greenlee Slug-Splitter SC Knockout. Punch through stainless steel in less time and with less potential for errors or alignment problems. What's changed with the new knockout? If you're interested in making sure your holes are perfectly centered, we've added a self-centering feature. This new feature greatly simplifies conduit hole and pilot device alignment. Just tighten down the punch on your draw stud and let our new punch center itself on the pilot hole. No more trying to line up the die alignment marks in poor lighting conditions or drawing crosshairs on the box to ensure alignment. Greenlee has once again given you a tool designed to make your job easier. Features Slug-Splitter SC heavy-duty punches are designed to punch up through 10 gauge (3.5 mm) stainless steel Unique slug-splitting design and tool steel construction easily punch 10 gauge (3.5 mm) mild steel and stainless steel Self-centering punch aligns itself on pilot hole. (Slug-Splitter SC) No need to draw crosshairsor line up die alignment marks Unique punch profile also splits slugs for easier slug removal Excellent abrasion resistance for punching fiberglass and plastic U.S. Patent No. 4,543,722 for standard Slug-Splitter Application: For Slug-splitter SC (Self Centering) Knockout Punch UnitGreenlee