Greenlee 28160 Greenlee 28160 Slug-Splitter SC (Self-Centering) Knockout Punch 1-1/4" Conduit Size Slug-Splitter 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 punch10 gauge (3.5 mm) mild steel and stainless steel. Self-centering punch aligns itself on pilot hole. No need to draw crosshairs or line up die alignment marks. Unique punch profile also splits slugs for easier slug removal. Heavy-duty dies and stainless steel draw studs for longer life. Excellent abrasion resistance for punching fiberglass and plastic. Operate with battery hydraulic or high leverage ratchet driver only. Patent Pending Hole SizesConduit Sizes Hole size is outside diameter of US conduit sizes.Example: 1/2" conduit size punch actually makes a 7/8" hole.Note: This item is a punch only. For complete set use:Die: 28161Draw Studs:31872 (For Hyd. Drivers: 7804 7904)29452 (For Hyd. Drivers 7646 7625)12099 (F