This is must have tool for repairing watches. The jaws on this tool clamp onto an acrylic/plastic watch crystal and slightly compresses the edges, allowing the crystal to simply lift away from the watch. Just do the reverse for fitting a new watch crystal. When fitting use the base plate included as this gives the clearance from the jaws enabling quick placement. If you need replacement crystals we can supply the best quality for the price crystals available in the UK.