Using the DeWalt DWA1181 drill bit set is easy. First, pick the right - sized bit for your project from the set. Make sure to check the size markings on the shank. Insert the bit into your drill chuck and tighten it well to prevent spin - out. When drilling, start at a slow speed, especially on harder materials like metal. The 135° split point tip will help keep the bit in place. As for maintenance, after each use, wipe the bits clean to remove any debris. The black - and - gold coating helps prevent rust, but it's still a good idea to store the bits in a dry place. If you notice any signs of wear or damage, it might be time to replace the bit. Also, always wear safety goggles when using these drill bits to protect your eyes from flying debris.