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modname=ckeditor 16mm-40mm White Height 0.8mm Thick 0.35mm Watch Crystal Waterproof Gasket Ring For Front Watch Repair Glass Parts Accessories Brand new front watch crystal glass waterproof sealing Gasket Ring. This is Not Back case sealing O-ring. Made of safe and durable TEFLON material. This is precise watch parts, please measure the watch glass groove careful to get accurate size. Diameter: 16-40mm (inner diameter) ; Thickness: 0.35mm, Height: 0.8mm. Package included: 1x watch crystal sealing ring. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ [Select reference] The inner diameter of the waterproof ring is selected to be equal to the diameter of the glass The height of the waterproof ring should be less than the height (thickness) of the glass. The outer diameter of the waterproof ring can be selected to be between 0-0.2mm larger than the inner diameter of the watch case groove (It is usually recommended to choose a waterproof ring with an outer diameter larger than the case groove by about 0.1-0.2mm for better waterproofing) For example, the diameter of the watch glass is 29.5mm, and the inner diameter of the watch case is 30.2mm Waterproof ring optional: 29.5mm inner diameter, 0.35mm thickness, outer diameter is 30.2mm (usable, just right, may be a bit loose) 29.5mm inner diameter, 0.4mm thickness, and 30.3mm outer diameter (recommended) 29.5mm inner diameter, 0.45mm thickness, 30.4mm outer diameter (recommended)