The Greenlee 7308 Stainless Steel Knockout Punch Kit includes 2½", 3", 3½", and 4" punches and dies for use in up to 10 ga stainless steel. The self-centering punch aligns on pilot holes, eliminating the need for crosshairs or die alignment marks. The kit also includes a draw stud, adapter, and a rugged plastic carrying case, ensuring portability and organization for your punching needs.