This kit includes an adjustable opener that is deisgned to engage with recesses on the back of watches. The moving lugs can be adjusted to get a tight fit to suit popular watch models.
The other half of the set looks like a small oyster shucking knife. Just fine enough to get into that tiny groove that some of the older watch covers have.
Essential economical tool for changing your watch battery!
Adjustable screw type watch case opener (adjustable to 6-50mm Diameter)
Double edged knife