Using this Rothenberger adjustable wide jaw wrench is a breeze. First, open the jaws to the size of the nut or bolt you need to work on. Place the jaws firmly around the fastener and start turning. For best results, make sure the wrench is properly seated on the nut or bolt. When using it in confined spaces, take your time to position it correctly. As for maintenance, keep it clean after each use. You can use a dry cloth to wipe off any dirt or debris. Avoid exposing it to extreme temperatures or moisture. If the wrench starts to feel a bit stiff, a light application of lubricant can help keep it working smoothly. Remember to register your product on the manufacturer's website to claim the standard one - year warranty.