Description:【Watch Case Back Gaskets】: Watch case back gasket set that is installed on the watch back case, can cover the space between the watch bands and movement

【Special Functions】: Watch back gasket, Play role in watch waterproof, suitable for watch repair and DIY watchmaker

【Size】This set contains 500pcs rubber o rings,10 different Inner diameter 31mm-40mm: 31mm 32mm 33mm 34mm 35mm 36mm 37mm 38mm 39mm 40mm, thickness 0

7mm(Each Size 50 Pieces) 【High Quality Material】: Rubber seal washer is made of high quality rubber material, flexible, wear resistant, and durable

【Nice Accessories】: Watch gasket kit, A substitute for the sealing gasket of the watch back cover

Specification:Material: RubberColor: Black0

7mmPackage Includes:1 Box 500Pcs Watch Case Back Gaskets