Using these ratchet crimping pliers is easy. First, select the appropriate connector you want to crimp. Make sure it's within the 0.08 - 0.5mm² (AWG28 - 20) crimping range of the pliers. Place the connector in the jaws of the pliers at the right position. Then, squeeze the handles. Thanks to the human - factors engineering design, you'll use 50% less energy compared to regular pliers. When you're done crimping, the self - releasing mechanism will make it easy to remove the connector. As for maintenance, keep the pliers clean after each use. You can use a dry cloth to wipe off any dirt or debris. Avoid using the pliers on connectors that are out of the specified crimping range as it may damage the pliers or result in poor crimping quality. Also, store the pliers in a dry place to prevent rusting.