Using this Klein Knockout Punch Set is easy. First, select the right punch and die for the size of the hole you need to make. Place the material where you want the hole on a flat surface. Then, use the included wrench to apply pressure and punch the hole. Make sure to wear safety goggles to protect your eyes from any flying debris. After use, clean the punches and dies with a dry cloth to remove any dirt or metal shavings. Store the set in a dry place to prevent rusting. Don't use the set on materials thicker than 10 - gauge, as it may damage the punches and dies.