Using your Klein Tools adjustable wrench is a breeze. First, determine the size of the nut or bolt you need to work on. Then, turn the knurl to adjust the jaw width to fit the fastener. Place the wrench firmly on the nut or bolt and turn it clockwise to tighten or counter - clockwise to loosen. When using in confined spaces, take advantage of the extra capacity to handle bigger jobs with this smaller - sized wrench. For safety, always make sure the wrench is properly seated on the fastener to avoid slippage. As for maintenance, after each use, wipe the wrench clean with a dry cloth to remove dirt and debris. To prevent rust, keep it in a dry place. If the chrome finish gets scratched, you can apply a light coat of oil to protect the metal underneath. With proper use and care, your Klein Tools adjustable wrench will serve you well for a long time.