CARL, Medium-Duty 3 Hole Paper Punch, 40 sheet punch capacity Carl 40-sheet capacity HC-340 heavy-duty three-hole punch. Three precision-ground all-steel 9/32" punch heads. Strong steel handle grip for easy open-handed punching. Strong steel handle grip for easy open-handed punching Built-in paper guide for quick paper positioning HANDLE locks down for storage and safety Limited lifetime warranty CARL Model: HC-340 / CUI63040 Hardened precision-ground all-steel punch heads Non-skid base Built-in paper guide Handle locks down for storage and safety Limited lifetime warranty - excluding punch heads and disks