Features: Ensures a smooth and safe cycling with the folding bike chain guide, designs to prevent chain drop and protect your bicycles drivetrain. Craft from high strength plastic, this light weight chain deflectors features clamps inner diameter of 31.8mm/40mm, making it perfect for chain setups and derailleurs. Great for cycling enthusiasts, this chain guide is especially designs for mountain bikers, race adventurers, and long distances cyclists seek enhancing stability. Perfect suit for daily commuting, outdoor exploration, and mountain biking, this chain guide ensures a unseamed ridings experience across various terrains. Enhances your bike performances with this easy to install chain guide, a must having accessory for those look to maintain great chain alignment and reduce wear. Specifications: Materials: Plastic Color: As The Picture Shows Type: 31.8mm/40mm (Optional) Inner Diameter: approx.31.8mm/1.25in (More Size Detail, Please See Picture.) Package Includes: 1Pc Folding Bike Chain Guide Deflectors Cover note: Please allow 1-3mm error due to manual measurement. Please make surer you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual color to the item. Thanks!