[DURABLE CONSTRUCTION] Made of metal, easy to dissipate heat, and provides flexible rotation for enhanced durability. [PROVIDE SMOOTH MOTION] Includes spacer, axle, and extra side plug to secure bearings, helping reduce drag and ensure smoother motion, while assisting in preventing bearing collapse. [EASY TO MATCH] Recessed spacer design fits between bearings for seamless integration with wheels, providing stable support and compatibility with standard male and female skate axles. [COMPATIBILITY & SIZE] Axle diameter: 6mm, frame spacer inner diameter: 6mm, wheel spacer inner diameter: 8mm. Suitable for most roller skates using 6mm axles. Please refer to the second product image for specifications and measure your wheel bearings to ensure proper fit. Style: A / B Color: Silver Material: Metal Package Contents: 10 x Axle 2 x Wrenches 16 x Side Plugs 8 x Three-Section Aluminum Casing 10 x Screws OR 10 x Axle 2 x Wrenches 8 x Three-Section Aluminum Casing 10 x Screws Package includes only the items listed above; other products not included. Note: Lighting and display differences may cause slight color variation between the image and the actual item. Measurement error allowance is +/- 1-3cm.