1.DURABLE CONSTRUCTION This bike chain guard is made of high quality PP materials and features excellent resilience, making it a nice addition to your cycling gear. The simple and wearresistant design ensures durability and always a smooth ride. 2.PERFECT FIT This bike chain guard is designed for 40 to 42 tooth sprockets and 5 hole crank sets with a hole spacing of 2.56 inches, making it ideal for a variety of mountain bikes and road bikes. The perfect fit ensures seamless installation and high performance. 3.PREVENT CHAIN DAMAGE Protect your bike's crankset and avoid damage caused by jumping or falling off the chain with our chain guard. It gives your bike a fashionable touch, gives it an elegant look while making it more attractive. 4.Boost performance: Enjoy powerful travel with improved features for daily exercise and longterm travel. Our heavy duty chain guard provides long term protection for your bike components, making it an essential addition to your cycling gear.