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1. Smooth edges and fine craftsmanship prevent burrs and reduce friction, enabling high-speed operation.2. Double-sided sealing ensures smooth operation, making it an ideal choice for hobbyists, engineers, and manufacturers.3. Ideal for applications where space is limited and precise motion control is required, these bearings provide excellent performance, whether you're working on complex models or delicate mechanisms.Item:6904 2RSType: Deep Groove Ball BearingClosures: 2 SealsLubrication: Self Lubricated (Grease)Dimensions: 20x 37 x 9 mmID (inner diameter)/Bore: 20mmOD (outer diameter): 37mmWidth/Height/thickness:9mmQuantity: 10 Bearings 1. High-performance bearings, designed for optimal performance, ensure smooth operation. 2. Low vibration, low noise, high precision, and extended service life. 3. Rubber covers provide additional protection, shielding the bearings from dust and dirt. Brand Name FEWLHJNM Manufacturer FEWLHJNM Material Type Metal Specification Met Ul