Gardner Bender KOS-750B Slug-Out Mechanical Knockout Set, Contractor Punch, Die & Drive Screw, ¾" Conduit Pipe Size Cutting Diameter, 10 AWG Mild Steel & 12 AWG Stainless Steel

Four-point punch design allows slug to fall free from the die without splitting, tapping or prying, Interchangeable with most tool brands, Punches 10 gauge mild and 12 gauge stainless steel, Punches hole designed for 3/4 Inch pipe or conduit, Actual hole diameter 1.086 inches