LLF Watch Repair Tool, Watch Case Open Ball Friction Ball Watch Case Opener, Sticky Rolling Ball Screw Repair Remover Watchmaker Tool

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About

Great for opening watch cases
Hold the watch in one hand and in the other hand, press the friction ball onto the back of the watch.
Start twisting to unscrew the watch back.
2-1/2 inches in diameter
and you can fill air by the basketball pump yourself if need full air