Features Smooth Surface: These carbon steel balls have a smooth mirror surface without burrs or bumps, making them safe and reliable in operation. Fine Processing: After fine processing with precision instruments, these solid steel balls have standard size and good rigidity, long service life and practical. High Hardness and Rigidity: The solid small steel balls are made of selected carbon steel material, which has high hardness and rigidity, which is durable and can be used for a long time. Widely Used: These 9mm steel balls are a good secondary replacement for bearing fittings for industrial equipment and are used in a wide variety of applications. 500 Steel Balls: The package kit includes 500 carbon steel balls with a diameter of 9 mm, 500 is a sufficient quantity, easy to use and replace, and can meet the needs. Specification: Item Type: Steel Balls Material: Carbon Steel Diameter: Approx. 9mm / 0.35in Applicable: Bearing Accessories Package List: 500 x Steel Balls Note: Store in dry or airtight conditions. Package List 500 x Steel Balls