1. High hardness and toughness: Bearing steel is a high-quality steel that is specifically designed for bearing applications. It is characterized by its high hardness and toughness, which makes it an excellent choice for applications that require high load-bearing capacity and durability. 2. resistance: Bearing steel is highly to and other forms of wear and tear. This makes it an Perfect choice for applications that are exposed to harsh environments or substances. 3. Low friction: The low friction coefficient of bearing steel 6203 bearings allows them to with minimal resistance, reducing energy loss and extending their lifespan. 4. High precision: Bearing steel 6203 bearings are manufactured to very high precision standards, ensuring that they are to provide smooth and efficient operation even under high loads. 5. Versatility: These bearings are widely used in a variety of small machinery applications, including skateboard wheels, inline skates, and electric motors. Overall, the features and advantages of bearing steel 6203 bearings make them an excellent choice for small machinery applications that require high load-bearing capacity, durability, and precision. Bearing steel 6203 bearings are a type of deep groove ball bearing that are made of high-quality bearing steel. These bearings are commonly used in skateboard wheels, inline skates, and other small machinery. size: Inner diameter 17mm, outer diameter 40mm, thickness 12mm Material: Bearing steel colour: As shown Package Contents: 20 x Bearing Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.