Knockout Punch For Use With Tool Type Battery-Hydraulic Manual-Hydraulic Ratchet Knockout Punch Component Included Punch Material Application Aluminum Brass Copper Fiberglass Mild Steel Plastic Stainless Steel Maximum Sheet Metal Capacity-Steel 10 ga Nominal Hole Size 2 27/64 in Slug Type Splits in Half Falls Free from Die and Stud Punch Shape Round Number of Pieces 1 Includes Draw Stud No Exact Hole Diameter 2 41/100 in Maximum Sheet Metal Capacity-Aluminum 12 ga