Function: 1. Attach your watch to the machine and turn the left joystick to open the back cover that is used to open the watch case. 2. Approximately 8,1 "/ 8" in length, with wrench, breaker, and other required parts of the package to meet your requirement. 3. Easy to use with non-slip material that won't damage your watch and won't interrupt the watch repair process. 4. A professional tool for watchmakers and watchmakers to save you expensive repair costs, practical to use. 5. The alloy material is durable and not easy to deform. It can effectively resist oxidation and rust and has a long service life. Usage: Attach your watch to the device and turn the left joystick to open the back cover Specification: Item type: Case opener for the back of the watch Material: alloy Length: Approx. 20.7 cm / 8.1 inches (manual measurement, please allow a little error) Applicable crowd: Suitable for watch maintenance professionals Application scenario: Used to open the back of the watch Package list: 1 x case opener for the back of the watch 1 x sand sponge 1 x wrench 7 x lever tools