When using a screwdriver, the most common mistake people make is to use the wrong size driver. You should always try to match the size of the screwdriver blade to the size of the screw as closely as possible. Mismatches will frequently result in the screw stripping, excessive wear on the screwdriver blade and a more difficult and time consuming job for you. Fortunately, finding the correct match is easy because screwdrivers are available in a complete variety of sizes and types.