Material: carbon steel Size: 8 * 22 * 7 CM Grease lubrication, limited speed: 1500 (rpm) Color: silver Quantity: 20 pcs Package content: 20 pcs * ball bearings 1. Standard size The ball bearing size is accurate, the inner diameter is 8 mm, the outer diameter is 22 mm, the width is 7 mm. 2. Commonly used type 608ZZ single row deep groove ball bearings are a family of commonly used models, good for most occasions. Carbon steel ball bearings, durability and resistance to deformation under heavy loads. 1500 rpm limit with grease lubrication. 3. High quality material Deep groove ball bearings are made of carbon steel, and the sealing material is iron cover, with bright metallic luster, longer service life and higher precision. 4. Fine workmanship Smooth edges, no burrs, low noise, high limit speed, and not easy to overheat, high load capacity, suitable for high demands. Inline skate bearings, low noise. High speed. High temperature resistance. Resistance to high loads. 5. Wide application Our ball bearings are widely used in motors, agricultural machinery, metallurgy, automobiles and wind turbines; Also widely used in everyday life, such as skateboards, children's toy cars, roller skates.