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This o-ring watch case back seal assortment contains thicknesses that range from .40 mm to .60 mm and the inside diameters range from 12.50 mm to 34 mm.
These round gaskets are made of solid tube rubber to create an airtight seal and are flexible enough to fit not only round watch case backs but, square, rectangle and other fancy shaped case backs.
NOTE: Diameter measured is the interior diameter of the gasket
