Size - 3/8" Diameter Grade G25 Chrome Steel Bearing Balls Material - Made of chrome steel with excellent surface quality, high hardness, high load capacity, and wear resistance. Features - Wide range of applications(maintain industrial equipment or use for family DIY projects); Cost-effective(can repair existing products) Applications - Maintain product that uses steel balls, such as ball bearings, turntable, drawer slides, casters, door locks; DIY projects like a keychain, or adding weight for your projects, etc. Notice - Confirm the Ball Diameter before ordering. Made of high-quality chrome steel to ensure excellent hardness and wear resistance. It possesses outstanding wear resistance and corrosion resistance, ensuring stable performance over extended periods of use. Whether in harsh environmental conditions or in applications requiring high precision, these bearing balls can provide reliable operation.