Feature:1. Quality plastic storage box makes your articles not easy to lose and more convenient to storage, convenient to use.2. Small and convenient, easy to carry and convenient transportation, exquisite workmanship, no scratching for watch.3. Including 40 different sizes of the waterproof ring, suitable for different watch types and watch model to use.4. One of the professional watch repairing tools, suitable for repairmen and amateurs to save expensive repair costs.5. Used to add waterproof ring to the watch or replace the waterproof ring, ensure the waterproof function of watch.Specification: Item Type: Waterproof O RingMaterial: Plastic Color: WhiteApplicable People: Watch maintenance professionalsApplication Scenario: Used to add waterproof ring to the watch or replace the waterproof ringSize: Approx. 41.3 x 40.5mm / 1.63 x 1.59in 43.3 x 42.5mm / 1.7 x 1.67in 45.3 x 44.5mm / 1.78 x 1.75in 47.3 x 46.5mm / 1.86 x 1.83in 49.3 x 48.5mm / 1.94 x 1.91in 41.8 x 41mm / 1.65 x 1.61in 43.8 x 43mm / 1.72 x 1.69in 45.8 x 45mm / 1.8 x 1.77in 47.8 x 47mm / 1.88 x 1.85in 49.8 x 49mm / 1.96 x 1.93in 42.3 x 41.5mm / 1.67 x 1.63in 44.3 x 43.5mm / 1.74 x 1.71in 46.3 x 45.5mm / 1.82 x 1.79in 48.3 x 47.5mm / 1.9 x 1.87in 50.3 x 49.5mm / 1.98 x 1.95in 42.8 x 42mm / 1.69 x 1.65in 44.8 x 44mm / 1.76 x 1.73in 46.8 x 46mm / 1.84 x 1.81in 48.8 x 48mm / 1.92 x 1.89in 50.8 x 50mm / 2 x 1.97in Package List:1 x Storage Box 40 x Waterproof O Ring