Using this Klein step drill bit is easy. First, make sure your drill is turned off and insert the 3/8'' hex shank of the drill bit firmly into the drill chuck. When you start drilling, the easy - to - read step markings will guide you to drill holes of the right size. The double - fluted design will cut through materials quickly. As for safety, always wear safety glasses to protect your eyes from debris. And don't use excessive force while drilling. After use, clean the drill bit with a brush to remove any chips or dust. Store it in a dry place to prevent rusting.