Knockout Punch Set Number of Pieces 10 Capacity 10 ga Stainless Steel Conduit and Pipe Size 2-1/2 in 3 in 3-1/2 in 4 in Workpiece Material 10 ga Stainless Steel For Use With LS100 Intelli-PUNCH 11-ton Battery Hydraulic Knockout Driver Includes Punches and Dies for 2-1/2 in 3 in 3-1/2 in 4 in Conduit Mfg. No 29452 Draw Stud 1557SS Sleeve Plastic Case