Specification Brand : Fdit2 BulletPoint1 : Rubber gasket set that is installed on the watch back case,can cover the between the watch band and movement BulletPoint2 : Play role in watch waterproof,suitable for watch repair and watchmaker BulletPoint3 : This is a set of 950pcs new o-rings gaskets,the o-rings different 19 sizes thickness 0.5mm BulletPoint4 : 19 different sizes from 12 to 30 mm: 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 and 30mm BulletPoint5 : Comes 50pcs each size in a poly bag (total: 50pcs x 19 = 950pcs) Color : Black ExternallyAssignedProductIdentifier : 8851680840668 ExternallyAssignedProductIdentifier1 : 750086260019 ExternallyAssignedProductIdentifier2 : 0750086260019 GpsrSafetyAttestation : 1 ItemName : 950pcs O Ring Watch Back Gasket Rubber Washers Set Replacement 12-30mm 0.5mm Black Home DIY Tools ItemPackageDimensions_Height : 19.1 centimeters ItemPackageDimensions_Length : 1.2 centimeters ItemPackageDimensions_Width : 13.9 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : watch-repair-tools Manufacturer : Fdit2 Material : Rubber ModelNumber : SJTG-SJT-BR#-TOOLPC-210722-B07RL4SJ5N NumberOfPieces : 950 PartNumber : Fdit2tov0kc1s98 ProductDescription : Features: Rubber gasket set that is installed on the watch back case,can cover the between the watch band and movement. Play role in watch waterproof,suitable for watch repair and watchmaker. This is a set of 950pcs new o-rings gaskets,the o-rings different 19 sizes thickness 0.5mm. 19 different sizes from 12 to 30 mm: 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 and 30mm. Comes 50pcs each size in a poly bag (total: 50pcs x 19 = 950pcs). Specifications: Material:rubber Color: black Item standard: Wire diameter: 0.5mm Coil diameter:(19 model, each model has about 50 pieces ) 12mm/13mm/14mm/15mm/16mm/17mm/18mm/19mm/20mm/21mm/22mm /23mm/24mm/25mm/26mm/27mm/28mm/29mm/30mm