Using the GearWrench 81815 combination wrench is easy. First, identify the size of the fastener you need to work on and match it with the stamped size on the wrench beam. Place the appropriate end of the wrench on the fastener. For tight spaces, take advantage of the 15° offset box end. Apply force in a steady manner to turn the fastener. Remember, this wrench isn't adjustable, so make sure the size is right. When it comes to maintenance, after each use, simply wipe it clean with a dry cloth. The full - polish chrome finish resists corrosion, but if you use it in a very wet or corrosive environment, it's a good idea to apply a light coat of oil. Also, keep it stored in a dry place. This wrench comes with a limited lifetime warranty, but avoid using it for jobs it's not designed for to ensure it lasts as long as possible.