500Pcs/bag Watch O-Ring Waterproof Rubber Watch Back Seal Cover kets Watch Repair Tool for Watcher Thickness 31-40mm

Feature:1, This o-ring watch case back seal aortment is a ket kit for watchers and others who work on watch case backs.2, These round kets are made of solid tube rubber to create an airtight seal that prevents water from entering the watch case.3, They are flexible enough to fit not only round watch case backs but, square, rectangle and other fancy shaped case backs.4, As this aortment includes kets of various sizes, you should definitely be able to find a correct match for the ket you need to rep.Specification:500pcs for 0.7mm: 31-40mm size (each size: 50pcs)500pcs for 0.8mm: 31-40mm size (each size: 50pcs)500pcs for 0.9mm: 31-40mm size (each size: 50pcs）(Note: OD9mm =0.9mm)Package List:1 Bag O-Ring kets(About 500pcs)

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