Description: The surface of the flywheel cover washer is processed by CNC precision forging anode process and hardening heat treatment, which not only strengthens the surface hardness, but also makes the lock ring beautiful and not easy to fade. The flywheel cover with anti-loosening ratchet and lightweight design, which can accurately adapt to your bicycle flywheel, multi-directional protection and not easy to loosen. Easy to install and remove. It is constructed of aluminum alloy material. The inner diameter is 3.03cm. The outer diameter is 3.6cm. The total height of the product is 0.72cm. Fit for most bicycles such as mountain bikes, road bikes, folding bikes, and more. Item Name: Flywheel Cover Material: Aluminum Alloy Features: CNC Process, Easy Installation, High Strength Size Details: Inner Diameter: 3.03cm/1.19"(Approx.) Outer Diameter: 3.6cm/1.42"(Approx.) Height: 0.72cm/0.28"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Flywheel Cover