1The design of the storage box makes your articles not easy to lose and more convenient to storage, convenient to use. 2Small and convenient, easy to carry and convenient transportation, exquisite workman, no scratching for watch. 3Including 98 different sizes of the waterproof ring, suitable for different watch types and watch model to use. 4One of the professional watch repairing tools, suitable for repairmen and amateurs to save expensive repair costs. 5Used to add waterproof ring to the watch or replace the waterproof ring, ensure the waterproof function of watch. Item Type: Waterproof ORing Material: Plastic Applicable People: Watch maintenance professionals Application Scenario: Used to add waterproofringto the watch or replace the waterproofring Double Ends Diameter: Approx. 16.8 x 16mm / 0.66 x 0.63in 17.3 x 16.5mm / 0.68 x 0.65in 18.8 x 18mm / 0.74 x 0.71in 19.3 x 18.5mm / 0.76 x 0.73in 20.8 x 20mm / 0.82 x 0.79in 21.3 x 20.5mm / 0.84 x 0.81in 22.8 x 22mm / 0.9 x 0.87in 23.3 x 22.5mm / 0.92 x 0.89in 24.8 x 24mm / 0.98 x 0.94in 25.3 x 24.5mm / 1 x 0.96in 26.8 x 26mm / 1.06 x 1.02in 27.3 x 26.5mm / 1.07 x 1.04in 28.8 x 28mm / 1.13 x 1.1in 29.3 x 28.5mm / 1.15 x 1.12in 30.8 x 30mm / 1.21 x 1.18in 31.3 x 30.5mm / 1.23 x 1.2in 32.5 x 32mm / 1.28 x 1.26in 33.3 x 32.5mm / 1.31 x 1.28in 34.8 x 34mm / 1.37 x 1.34in 35.3 x 34.5mm / 1.39 x 1.36in 36.8 x 36mm / 1.45 x 1.42in 37.3 x 36.5mm / 1.47 x 1.44in 38.8 x 38mm / 1.53 x 1.5in 39.3 x 38.5mm / 1.55 x 1.52in 17.8 x 17mm / 0.7 x 0.67in 18.3 x 17.5mm / 0.72 x 0.69in 19.2 x 19mm / 0.76 x 0.75in 20.3 x 19.5mm / 0.8 x 0.77in 21.8 x 21mm / 0.86 x 0.83in 22.3 x 21.5mm / 0.88 x 0.85in 23.8 x 23mm / 0.94 x 0.91in 24.3 x 23.5mm / 0.96 x 0.93in 25.8 x 25mm / 1.02 x 0.98in 26.3 x 25.5mm / 1.04 x 1in 27.8 x 27mm / 1.09 x 1.06in 28.3 x 27.5mm / 1.11 x 1.08in 29.8 x 29mm / 1.17 x 1.14in 30.3 x 29.5mm / 1.19 x 1.16in 31.8 x 31mm / 1.25 x 1.22in 32.3 x 31.5mm / 1.27 x 1.24in 33.8 x 33mm / 1.33 x 1.3in 34.3 x 33.5mm / 1.35 x 1.32in 35.8 x 35mm / 1.41 x 1.38in 36.3 x 35.5mm / 1.43 x 1.4in 37.8 x 27mm / 1.49 x 1.06in 38.3 x 37.5mm / 1.51 x 1.48in 39.8 x 39mm / 1.57 x 1.54in 40.3 x 39.5mm / 1.59 x 1.56in 40.8 x 40mm / 1.61 x 1.57in 1 x Storage Box 98 x Waterproof ORing