These chrome steel sealed ball bearings are suitable for various applications, including bicycles and wind spinners. The rubber seal prevents dirt and moisture from entering, ensuring a longer lifespan. To install, remove the old bearings and press the new ones into the housing. Lubricate with ball bearing grease to ensure smooth operation and reduce wear. Features -Color:Assorted Color -Material:Steel -Size:4.70X4.70X1.00cm/1.85X1.85X0.39in -Wearresistant steel: made from bearing steel, these ball bearings are highly resistant to wear, ensuring a performance - protection: the dual cover design effectively shields the bearings and debris, maintaining their efficiency and longevity -Accurate engineering: precision machining sure the accuracy and stability of these bearings, making them ideal for various mechanical applications -Wide range of uses: these bearings are suitable for a variety of machinery, including motors, automobiles, and agricultural equipment, offering great versatility -Broad application: ideal for household appliances, garden machinery, vehicles, electric toys, tools, and industrial production, these bearings provide broad application potential Package list: 4pcs deep groove ball bearings