Using your GearWrench 81920 combination wrench set is a breeze. First, pick the right size wrench for the fastener you're working on. The sizes are clearly marked on the open - end head and the beam, so it's easy to find the one you need. To use the open - end part, just place it over the fastener and turn. For the box end, which is offset at 15°, it's great for getting into tight spots. Slide it onto the fastener and start turning. Remember, this set can deliver up to 25% more torque thanks to the off - corner loading design, so you don't have to use as much force. As for maintenance, the bright, fully polished chrome finish is easy to clean. Just wipe it down with a cloth after use to keep it looking good and prevent corrosion. Store the wrenches in the included tool roll to keep them organized and protected. And because it has a limited lifetime warranty, you can use it with confidence, but always use it for its intended purpose to avoid any damage.