1. PREMIUM MATERIALChain guide is made of aluminium alloy 7075 CNC, which is light, strong, durable, resistant to wear and tear and deformation. Simple design with beautiful appearance for matching various colors of bikes. 2. EASY INSTALLATIONNo need to remove your crank, You can adjust it directly with a wrench. Bicycle chain guard protector is easy to install and adjust! 3. EFFECTIVE CHAIN PROTECTIONThis MTB chain guide can protect the chain from falling off, effectively prevent the chain and chain from jumping, avoid chain interference while riding, ensure the and smoothness of the ride. 4. SPECIFICATIONSMTB chain guide is perfect for bicycle tube diameter 31.8 to 35mm washer. The spacer is included in our package. You can to occasionally check whether the screws are tight, this is for your . Note: 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.