This waterproof ring is designed for S. Watch Parts brand watches with a crystal size of 0.45x0.9x39mm. It is a perfect tool for those who want to keep their watch waterproof and prevent any leaks. The ring is made from high-quality materials and is guaranteed to last for a long time.

It is suitable for both professional watchmakers and hobbyists who want to keep their watches waterproof. This tool is classified under the category of Jewelry & Watches, Watches, Parts & Accessories, Parts, Tools & Guides, and Tools & Repair Kits. Get your hands on this waterproof ring and keep your watch waterproof for years to come.