These flat black rubber gaskets generally fit into a groove or recess in the back of the case and are most commonly used with a threaded case back. Simply measure the inside diameter and outside diameter of the groove the gasket will fit into on the case. Subtract the inside diameter from the outside diameter then divide in half to find the thickness of the gasket you need to fit your watch case. With 100 different diameters and multiple thicknesses in this kit, you should be able to find a gasket to fit your watch. With 3 pieces of each size flat gasket in this kit you can be sure to find a gasket to fit your watch.
- Kit contains 3 pieces of each size
- Kit contains 100 different sizes
- Maintain airtight seal
- Made of Rubber
- **Note** Diameter measured is the interior diameter of the gasket