CARL HC-340 Medium-Duty Hole Punch - 3 Punch Head(s) - 40 Sheet Capacity - 0.28" - Silver. Punch is preset to punch three-hole pattern for three-ring binders. Built-in paper guide ensures perfect positioning. Oversized handle allows easy open-handed punching and locks down for storage and safety. Hole-punch also offers a large capacity waste tray and heavy-gauge steel construction.