

This extra large diameter o-ring watch case back gasket assortment includes 144 gaskets of various sizes in a particular thickness. These round gaskets are made of solid tube rubber to create an airtight seal that prevents water from entering the watch case. They are flexible enough to fit not only round watch case backs but, square, rectangle and other fancy shaped case backs.
Note: Diameters measured are the interior diameter of the gasket
Assortment Styles are available in nine different thickness options. Simply select the thickness you need from the drop down menu above.
*Sizes are approximate as measurements may vary slightly by gauge.