EZ Squeeze™ technology by PaperPro requires 50% less force to easily punch multiple sheets. No-Jam™technology for smooth, hassle-free punching. Metal construction for superior performance and durability. Integrated ruler for convenient measuring. Paper guide keeps documents in place for hole placement accuracy. Easy-clean chip tray for less mess. Handle lock for easy storage. Punches standard three-hole configuration. silver ion-based agent.