Using the Klein 31872 Carbide Hole Cutter Set is easy. First, pick the right size cutter for your material. Attach it to your drill. The split point pilot drill bit helps you start drilling in the right place without it slipping. When you're drilling, be careful not to push too hard. The integrated flange will stop you from going too deep into the sheet metal. After use, clean the cutters with a brush to remove any debris. Store them in a dry place to prevent rust. If you notice the cutters getting dull, it might be time to replace them.