This tool is designed to open practically all types of cases with press backs. This tool lifts snap type watch case backs, easily popping off even the most tightly closed. Just position the point between the case back and the case, and slowly push. The blade pops under the back, making it easy to lift off. There is nothing like this on the market today.Has four plastic posts to prevent damage, Posts can be removed. Can be set into different positions for different cases. Opens and closes with large knobs