Have you ever worried about scratching your watch crystal while you are trying to open the case back? You don't have to worry anymore: this convenient case cushion helps to protect crystals and prevent scratching when you are snapping case backs on or off, removing case back screws, or a number of other services. The case cushion is wrapped with a metal ring to help it keep its shape. It has a diameter of 53mm (2.08" inches) which handily fits even those popular extra large watches.