Using the DeWalt DWAH1110 drill bit set is easy. First, choose the right bit size for your material. Whether you're working on metal, wood, or PVC, these bits are up to the task. Insert the 1/4' Hex Shank bit into your drill or impact driver. Make sure it's firmly in place. When drilling, apply steady pressure, and let the 135° split - point tip design do its job to reduce walking. As for maintenance, after each use, wipe the bits clean to keep them free from debris. The black and gold finish helps prevent rust, but if you notice any signs of wear, it's a good idea to store them in a dry place. Also, be careful not to over - torque the bits when using an impact driver to avoid breakage. Enjoy your drilling projects with this reliable set!