Bicycle center lock to six-bolt hub adapter Colors: black, red, blue, yellow, purple, green Material: Aluminum alloy Dimensions: 55 * 44 * 9mm Thickness: 9mm Braking system: hydraulic disc brakes (hydraulic brake pads) Package weight: 30g Packing list: Center lock*1 6-hole adapter*1 Features: 1. Made with high-quality materials and CNC-machined for superior strength, rust resistance, and dimensional stability, ensuring exceptional durability and practicality 2. CNC machining ensures a smooth surface, which helps prevent wear and damage. 3. Easy to install and use. 4. Suitable for installing a center lock hub with six bolts.