This wrist watch press tool is used in many ways. It can be used in crystal installation and also as a bezel press. Very useful for battery replacements on snap back watches. Some watches like the Museum watch and some Fossil watches will certainly need this tool to do a battery replacement. The reason for this is the back is so tight if its done with the fingers the crystal breaks every time. This tool is great for a perfect and secure fit for the watch. This is because of its 12 dies that are included have a variety of sizes to get the right one.