Using the DeWalt DWMT82839 kit is easy. First, select the right socket from the 5 available deep sockets that fit your lug nut size. Attach it to the 1/2 in. drive micrometer torque wrench. If you need extra force to loosen a tight lug nut, you can use the breaker bar. When using the torque wrench, set the desired torque level using the locking trigger. The forward and reverse torque capabilities allow you to both loosen and tighten lug nuts. The pen light comes in handy when you're working in a dark or poorly - lit area. Just switch it on for better visibility. As for maintenance, after each use, wipe down the tools with a clean cloth to remove dirt and debris. Keep the kit in its durable case with metal latches to protect it from damage. Also, make sure to store it in a dry place. Don't use the tools beyond their specified torque limits, as this could damage them and compromise your safety.
