Size packaging:Dimension: Inner diameter: 17mm, outer diameter: 47mm, thickness: 14mm. Packaging:(2 Pcs)6303-2RS deep groove ball bearing.  High quality materials：The bearing is made of high-precision bearing steel, Even at high speeds or heavy loads, it can ensure high precision, durability, and wear resistance,The dual rubber seal provides excellent anti-corrosion protection.Save grease and prevent impurities from entering.  widely applicable：Universal high hardness bearing steel double rubber sealed deep groove ball bearingSuitable for deep groove ball bearings on wheels of automobiles, bicycles, motorcycles, carts, mechanical applications, electric motors, skateboard wheels, lawn mowers,miter saw, air compressors, etc., if it produces noise, cracks, low speed, and friction differences during operation.  Cr - Dynamic Load Rating 13.6 kN C0r - Static Load Rating 6.6 kN