Greenlee 28154 Slug-Splitter Self-Centering Knockout Punch, 7/8-Inch Hole For use with Greenlee die 28155 and draw studs 29451 or 30227 Slug-Splitter SC heavy-duty punches are designed to punch up through 10 gauge (3.5 mm) stainless steel Self-centering punch aligns itself on pilot hole Unique punch profile also splits slugs for easier slug removal Can be used with Greenlee ratchet driver 1904 or hydraulic drivers 7804/7904 and 7646/7625