Watch Waterproof Seals Rubber Watch Waterproof Ring Watch Crown ORing Repair Accessory Item Type: Watch Crown O-Ring Material: Rubber  Color: Black  Applicable Crowd: Suitable for watch maintenance professionals Application Scenario: Used to keep the watch level waterproof, prevent water getting into watch Size: Approx.  3.2 x 1.7 x 0.75mm / 0.13 x 0.07 x 0.03in 3.2 x 1.8 x 0.7mm / 0.13 x 0.07 x 0.03in 3.4 x 1.8 x 0.8mm / 0.13 x 0.07 x 0.03in 3.6 x 1.7 x 0.8mm / 0.14 x 0.07 x 0.03in 3.65 x 2.15 x 0.75mm / 0.14 x 0.08 x 0.03in 4.6 x 3.2 x 0.7mm / 0.18 x 0.13 x 0.03in 4.25 x 2.25 x 1mm / 0.17 x 0.09 x 0.04in 4.2 x 2.8 x 0.7mm / 0.17 x 0.11 x 0.03in 4 x 1.8 x 1.1mm / 0.16 x 0.07 x 0.04in 3.8 x 2.2 x 0.8mm / 0.15 x 0.09 x 0.03in