Specification AgeRangeDescription : Adult Brand : DS. DISTINCTIVE STYLE BulletPoint1 : Waterproof Your Watch Again - These watch seals are made of solid tube rubber to create an airtight seal and are flexible enough to fit different shaped case backs BulletPoint2 : One Set Fits Most - Set of 19 sizes. These assorted sizes o-ring gaskets fit a variety of watch case backs in diameter from 12 mm to 30 mm/0.47 inch to 1.18 inches; Allows watchmakers and others who work on watch case backs to select exactly the o-ring gasket they need BulletPoint3 : Measuring Tips - Measure the outside diameter of the inside lip on the gasket, where the old gasket was seated; Be sure to select a gasket that is point-one millimetre smaller in diameter than measured to ensure a tight seal; Should use a digital gauge BulletPoint4 : Thickness: 0.6 mm/0.024 inch (referring to the difference between inner and outer diameter); Sizes: 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 and 30 mm/0.47, 0.51, 0.55, 0.59, 0.63, 0.67, 0.71, 0.75, 0.79, 0.83, 0.87, 0.91, 0.95, 0.99, 1.02, 1.06, 1.10, 1.14 and 1.18 inches BulletPoint5 : Package includes: Watch Back Round Gasket x 950 (50 pieces x 19 sizes, other accessories are not included) ClaspType : Tang Buckle Color : Black CompatibleDevices : Watch Department : unisex-adult ExternallyAssignedProductIdentifier : 4894453479430 ExternallyAssignedProductIdentifier1 : 689466138993 ExternallyAssignedProductIdentifier2 : 0689466138993 ExternallyAssignedProductIdentifier3 : 00689466138993 GemType : goshenite GpsrSafetyAttestation : 1 GradeRating : Premium ItemDisplayWeight : 0.22 pounds ItemLength : 4.64 inches ItemName : DS. DISTINCTIVE STYLE O Ring Watch Gasket 950 Pieces 0.6 mm Thickness Assorted Sizes 12 mm to 30 mm Waterproof Seal Replacement O-Ring Gaskets ItemPackageDimensions_Height : 18.288 centimeters ItemPackageDimensions_Length : 1.905 centimeters ItemPackageDimensions_Width : 9.6012 centimeters ItemPackageQuantity : 1 ItemShape : Oval ItemTypeKeyword : watch-repair-tools Lifestyle : Fashion Manufacturer : DS. DISTINCTIVE STYLE Material : Rubber MetalType : No Metal ModelName : 3153 ModelNumber : 62573138646MQBUACC NumberOfBands : 1 NumberOfItems : 1 NumberOfPieces : 950 OccasionType : Father's Day PartNumber : 1 Pattern : Solid PowerSourceType : Mechanical (watch only) ProductDescription : These O Ring Watch Gasket 950 Pieces 0.6 mm Thickness Assorted Sizes 12 mm to 30 mm O-Ring Gaskets include multiple sizes to allow watchmakers and others who work on watch case back to select exactly the o-ring gasket they need. Note: The seals that prevent water from entering the watch will weaken and fail with age. The watch gaskets should be replaced at least every two or three years. ProductSiteLaunchDate : 2009-10-28T00:00:01-00:00 ShipsGlobally : 1 Size : 0.6 mm SportType : Walking StrapType : Two Piece Strap StreetDate : 2013-09-15T00:00:01Z Style : Modern SubjectCharacter : Fashion SupplierDeclaredDgHzRegulation : not_applicable TargetGender : unisex Theme : Sports UnitCount : 950 UnspscCode : 31401503 WarrantyType : Manufacturer WatchBandDesign : standard WatchMovementType : Quartz WaterResistanceDepth : 100 meters WaterResistanceLevel : water_resistant