Feature: 1. Ergonomic design: This bicycle crank guard is lightweight and will not increase the burden of riding. The ergonomic circular design can produce greater traction, reduce leg or knee fatigue, and ensure a smooth ride 2. Durable plastic material: The mountain bike chain guard is made of high-quality plastic material, which is sturdy and durable, has good wear resistance and durability, and is not easy to deform or break. Ideal for replacing old bicycle chain guards. 3. Provide effective protection: This chain guard is designed to protect the bicycle chain from scratches and abrasions, thereby prolonging its service life. And it can effectively prevent the chain fat from staining your pants, making your riding more relaxed and enjoyable. 4. Excellent chain accessories: The design of the bicycle chain cover is simple and classic, and it is an essential accessory for the sprocket.Compatible for Shimanos M430, M590, M390, suitable for most 42T and 44T bicycles, mountain bikes, road bikes, etc. 5. Easy to install: We provide 4 screws, you only need to align the holes of the bottom bracket cover and tighten the screws. To provide you with a convenient experience, the outer diameter is 20cm. (In order to match your bike, please pay attention to the size of the comparison product) 6. Superior bicycle chain protector and 4 screws plastic bicycle chain cover crank cover mountain bike crank protector black crank protection cover suitable for mountain bikes, road bikes. Specification: Name: Bicycle chain coverMaterial: PlasticOuter diameter: 20 cmColour: BlackWeight: 70 grams Package List: 1 * Road bike chain protecto Note: Due to the different monitor and light effect,the actual color maybe a slight different from the picture color.Please allow 1-2cm differs due to manual measurement.