Plastic Ball Opening Watch Backs

Die sizes: 21, 26 and 29 mm. For opening and closing Baume & Mercier screw-back cases.

Magnetic key inserts saves a lot of time.
European quality

Die Sizes (mm): 18.50, 20.20, 22.50, 26.50, 28.30, 29.50.
To open oyster style watches. Watch gets locked into position so that it reduces the chances of scratching.

Insert the hook into the notch of the case back and pop it open.