Using the DeWalt DWHT80270 adjustable wrench is a breeze. First, decide which size of fastener you're dealing with and adjust the wrench jaws using the markings on the tool. Place the jaws around the fastener and grip the handle firmly. The flared end of the handle helps keep your hand in place. When working, make sure the jaws are properly seated on the fastener to avoid slippage and potential injury. For maintenance, after each use, wipe the wrench clean with a dry cloth to remove dirt and debris. If it gets wet, dry it thoroughly to prevent rust. Periodically, you can apply a light coat of oil to keep the moving parts working smoothly. Store the wrench in a dry place, away from moisture and extreme temperatures.