OTOOLWORLD Watch Case Open Ball Friction Ball Watch Case Open Ball Battery Change
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The ball is already full of air + 1 ball needle
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
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