about this article Sturdy & durable: The bicycle chain cover is made of high quality plastic material, which is durable, has good wear resistance and durability, is not easily deformed or broken, and can be used for a long time. br>Provide protection: This chain cover is designed to protect the bicycle chain from scratches and friction, and effectively prevent the grease on the chain from dirt from entering, thus extending the service life. While preventing clothes from getting dirty Easy to install: We provide 4 screws for you, you just need to put on the bike crank protection cover and tighten the screws. Provide you with convenient use. 14.5cm outer diameterErgonomic Design: This bicycle chain ring is lightweight and does not add to riding load. Ergonomic circular design produces better traction, reducing fatigue on legs or knees and ensuring a smooth rideBicycle accessories: As long as your bicycle chainring is 42T, 44T, this bicycle chain cover can be installed. Suitable for Shimanos M430, M590, M390, it is an important part of mountain bike, road bike, etc Product Feature 1.A good substitute for old or damaged parts of bicycle chain cover. 2.Made of high quality plastic materials, high strength, wear resistant, not easy to break. 3.Effectively prevent grease from running off the dirt chain and staining clothes. 4.Bike chainring guard is designed to protect your bike chain from scratches and chafing. Provides good protection for the bike chain. 5.The bicycle chain guard cover is suitable for 42T and 44T bikes, mountain bikes, road bikes, etc. Specification Product Name: Bottom Bracket Cover Materials: plastic Outer diameter: 14.5cm Color: black Weight:70g Packaging included 1*bike chain ring "