EZ Squeeze technology by PaperPro requires 50% less force Easily punches up to 12 sheets Reduced Effort 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 A portion of the proceeds from this purchase is donated to cancer charities via the Amax Spirit Foundation