Bergeon 8008 B Ball. Rubber Ball to Open and Close All Types of Screw Bottom Boxes - Watchmaker Tool - Swiss Made

Works well, and great value for the price.

Have some watched with really large backs works perfect but sometimes you need to remove the straps to get the levarge

Excellent quality gets the job done

Exactly as expected

It is well worth getting and goes a long way toward making it easier to remove the backs of the watch without scratching it.

Fairly easy to use. Did the job well.

Super smooth so does not grip the back of the watch at all. You might just as well buy a toy ball for £3 pound.