Knockout Punch For Use With Tool Type Battery-Hydraulic Manual-Hydraulic Knockout Punch Component Included Punch Material Application Aluminum Brass Copper Fiberglass Mild Steel Plastic Maximum Sheet Metal Capacity-Steel 10 ga Nominal Hole Size 3 17/32 in Slug Type Falls Free Punch Shape Round Number of Pieces 1 Includes Draw Stud No Exact Hole Diameter 3 53/100 in Maximum Sheet Metal Capacity-Aluminum 10 ga Series Speed Punch