Feature: 1. Rubber O?ring watch gasket can keep the watch waterproof, designed for watch repairing. 2. About 800pcs / box, including different size of the waterproof seals, suitable for different watch. 3. The included plastic box has 10 grids to keep all parts organized and easy to carry. 4. Suitable for watchmakers and watch repairing workers to use, lightweight makes it convenient to carry. 5. Made of rubber material, good flexibility, wear?resisting, durable and reliable in use. Specification: Condition: New Item Type: Watch Crown O?Ring Material: Rubber Quantity: About 800pcs / box Usage: Used for repairing watch, rubber O-ring waterproof seals Package List: 80 x O?Ring 1.4 x 0.6 x 0.4 80 x O?Ring 1.5 x 0.6 x 0.7 80 x O?Ring 1.6 x 0.6 x 0.5 80 x O?Ring 1.7 x 0.7 x 0.5 80 x O?Ring 1.8 x 0.8 x 0.5 80 x O?Ring 1.8 x 0.8 x 0.7 80 x O?Ring 2.4 x 1.4 x 0.5 80 x O?Ring 2.8 x 1.75 x 0.53 80 x O?Ring 3.2 x 1.8 x 0.7 80 x O?Ring 3.6 x 1.7 x 0.8