Greenlee 720 Keyway Nibbler Hole Punch

Using the Greenlee 720 Keyway Nibbler Hole Punch is quite easy. First, determine the size of the keyway you need for your push - button switch, whether it's 1/8' (3.2 mm) or 3/16' (4.8 mm). Place the tool on the 10 gauge (3.5 mm) mild steel where you want to punch the keyway. Then, apply appropriate pressure to punch the hole. If you need wider or deeper keyways, you can use it as a nibbler. When using it, make sure to wear proper safety gear like gloves. After each use, clean the tool to remove any metal shavings. Store it in a dry place to prevent rusting. And don't try to use it on materials that exceed its 10 - gauge mild - steel capacity, as it may damage the tool.