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It is used on watch crystal to make the watch waterproof, NOT watch back case cover! for professional users! 0.85mm Height Waterproof I-ring Watch Crystal Gasket 28mm-40mm F81651. Fits for 0.9-1.2mm thick watch crystal.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.