Using your GearWrench 81917 combination wrench set is a breeze. First, identify the right size wrench for your fastener by checking the stamped sizes on the open - end head and the beam. Place the appropriate end of the wrench on the fastener and turn it in the direction you need to either loosen or tighten. When working in tight spaces, take advantage of the 15° offset box end for better access. Remember, these wrenches are designed to provide a strong grip and extra torque, so use them with confidence. As for maintenance, after each use, simply wipe them down with a clean cloth to keep the bright chrome finish looking good. Avoid using them on fasteners that are too large or too small for the wrench size, as this can damage both the wrench and the fastener. Store your wrenches in the included tool roll to keep them organized and protected. With proper use and care, this set will serve you well for a long time.