30mm diameter rubber 'pads' on giant 'pliers', for pressing the backs onto watches, e.g. when you take a snap-back back off a watch to change the batteries then, to your embarrassment, can't get it back on again.

Good for when you need that extra bit of help. But if the back really won't go back on, you'll need a heavy duty watch press.

This one has the advantage of being (relatively) small and portable.