Material :Bearing steel GCR15 (100Cr6). Characteristics: high precision, high hardness, smooth surface, good roundness, wear-resistant. Application areas: steel balls are widely used in bearings, motors, hardware, electronics, iron art, machinery parts, automotive parts precision instruments, medical equipment, fishing gear, toys and other fields. Product description: Bearing steel ball with high precision and high hardness, hardness above HRC60, smooth surface, roundness and good wear resistance. Customers with high hardness and high dimensional accuracy requirements can choose. Bearing steel material is not waterproof, not rustproof, please pay attention to maintenance. 1Due to the lighting effects and shooting angles, there is color difference in the product, please understand. 2 Due to manual measurement, there is a tolerance in the product size.