What sizes of watch case O-rings are included in this kit?

Comprehensive Selection: One box contains multiple size options (including 0.5mm and 0.6mm cross-sections) to suit a wide range of watch case diameters and styles.
Waterproof Seal: High-quality rubber construction creates a tight, reliable seal that keeps moisture and dust from entering the watch case.
Oil-Resistant Material: Specially formulated rubber resists oils and lubricants commonly used in watch servicing, ensuring the gasket stays flexible and effective over time.
20 Color/Size Options: Choose from a variety of options to match your specific repair needs or case specifications.
Ready to Use: No additional tools required — simply select the correct size O-ring and seat it in the case groove for an instant, professional-grade seal.
Great Value: One box provides enough gaskets for multiple repairs, making it a smart addition to any watch repair toolkit.

This kit includes rubber O-ring gaskets with cross-section sizes of 0.5mm and 0.6mm, available across 20 size/color options to accommodate a wide variety of watch case diameters and back cover styles — from standard round cases to square and cushion-shaped designs.

Will these O-rings restore water resistance to my watch after a battery change?

Yes. Replacing the case back gasket with a fresh O-ring from this kit is one of the most effective ways to restore a proper waterproof seal after opening a watch case for a battery change or service. Simply select the correct size, seat it in the groove, and reassemble the case.

Are these O-rings compatible with all watch brands?

These are universal rubber O-ring gaskets designed to fit a broad range of watch cases. They are not brand-specific, so you can match the correct size to your watch case dimensions. We recommend measuring your existing gasket or case groove diameter before selecting a size for the best fit.