Hollow punch head technology requires less force. Preset to drill holes for standard three-ring binders. Built-in paper guide for quick paper positioning and punching. Rubber padded handle ensures comfort and no slipping while punching. Large, easy-to-empty waste tray. Heavy-gauge steel construction. Sheet Capacity: 72; Operating Method: Manual; Number of Holes: 3; Hole Diameter: 9/32 in.