Using the Klein Tools 3005CR ratcheting crimper is a breeze. First, identify the size of your insulated wire terminal. The color - coded markings on the tool will help you pick the right crimping cavity. Place the terminal and the wire into the appropriate cavity. Then, simply squeeze the handles. The built - in ratchet ensures a full - cycle crimp. When using, make sure the wire is properly inserted into the terminal to get a good crimp. Also, avoid over - squeezing as it may damage the terminal. For maintenance, keep the tool clean. Wipe it down after each use to remove any dirt or debris. You can also apply a light coat of oil to the moving parts occasionally to keep them working smoothly. This will help extend the life of your crimper.