Features: CNC aluminum alloy mountain bike color crank cover BB central axis screw sprocket specifications Aluminum alloy CNC machining, precision & strength, much better than the original plastic screws. Various colors, suitable for personality modification. parameter： Size: M18/M19/M20 Material: Aluminum Alloy Weight: 7g Color:Black,Red,Blue,Rainbow color M18 threaded screws are suitable for PROWHEEL hollow chain ring FS.A crankset and the old FC 4500 and FC 5600 highway cranksets, etc. Crankset etc. M19 threaded screws are suitable for IXF, LEBYCLE and other brands of hollow integrated crankset M20 crank cover screw for Shiman0 kit Such as: M4000, M590, M596, M661, SLX, XT, XTR and other integrated chainrings If you are not sure about the specifications, please measure by yourself. Package includes: 1pc Crank Bolt Cover Cap 【Precision CNC Machining】The crank cover is made of CNC aluminum alloy, ensuring precision and strength. With improved durability compared to plastic screws, it provides a reliable solution for fixing the crank arm. 【Vibrant Colors】Available in various colors, this crank cover allows for personalization and modification of your bike. Choose from black, red, blue, or rainbow to add a touch of style to your ride. 【Wide Compatibility】This crankset screw is compatible with different specifications. The threaded screws fit hollow chain rings, FS.A cranksets, and older FC 4500 and FC 5600 highway cranksets. The M19 threaded screws are suitable for IXF, LEBYCLE, and other brands of hollow integrated cranksets. The M20 crank cover screw fits M4000, M590, M596, M661, SLX, XT, XTR, and other integrated chainrings. 【Lightweight and Durable】Made of aluminum alloy, the crank cover is lightweight, weighing only 7g. It offers excellent strength and durability, ensuring long-lasting performance. 【Easy Installation】With the package including 1pc Crank Bolt Cover Cap, the installation process is quick and hassle-free. replace your existing crank arm fixing bolt with this cover for added protection and style.