Watch Case Back Opening Tool, Adjustable Back Case, Watch Battery Case Made of high quality and durable steel.Plastic handle.Waterproof watch will be tighter than ordinary watch, need more strength to open,going to rotate it counterclockwise,unfold Remove the back cover of your watch or change the batteries easily. best can cooperate to watch fixed worktable used together, B01MA1BW6L This Watch Removal Tool can use of double-sided, two shaving heads. [note] Open the max diameter: 35 mm [note] It only works on screw If you need to Open a large watch, please purchase one of our other large watches to Open the tool, please search ( B01MRR674Z ) For Open up to 62mm