Using the DeWalt DWA56015 drill bit set is easy. First, select the appropriate drill bit size for your material. Insert the bit into your drill. Hold the drill firmly and start drilling at a slow speed, then gradually increase the speed as needed. Make sure to keep the drill perpendicular to the surface for a straight hole. When you're done, place the bits back in the case for storage. To keep the drill bits in good condition, clean them after each use with a dry cloth. Avoid using the bits on materials that are too hard for their capacity, as this can damage the bits. Also, store the set in a dry place to prevent rusting.