Using the CN - 10 cable cutter is easy. First, make sure the wire latch is open. Then, place the cable or housing you want to cut between the cutting jaws. Squeeze the handles firmly to get a clean cut. If you need to use the crimper, put the cable end cap in the crimper part and press. For reforming housing ends and ferrules, use the forming hole. When not using the cutter, close the wire latch to keep the handles together. Keep the cutter clean after each use. Wipe off any dirt or debris. You can also apply a little oil to the moving parts occasionally to keep it working smoothly. Don't use it on materials other than bicycle cables and housing, as this may damage the cutter.