Using this Klein locknut wrench set is easy. First, identify the right - sized wrench for your conduit. You can quickly tell them apart by the color and markings. To tighten or loosen a locknut, place the hooked tip of the wrench on the locknut and apply force. The offset bends help you reach locknuts in tricky spots. When you're done using the wrenches, the internal magnets will hold them together, so just put them back in your toolbox. As for maintenance, keep the wrenches clean and dry. Wipe them down after use to prevent dirt and moisture from causing corrosion. Avoid using excessive force that could damage the wrenches. With proper care, this set will last you a long time.