Description: Anti-drop: This kind of bicycle chain guide can be used to protect the chain when riding or cycling, preventing the chain from slipping or falling off, making your biking more convenient. Adjustable: The 35mm-31.8mm bike frame protector can be adjusted with a spanner, you do not need to remove the crank, making your repair easier. Good replacement: This chain tensioner is suitable for single-disc sprocket, it can repair your bike easily and replace the old or damaged one perfectly, prolonging the service time of your bicycle. Anti-abrasion: This kind of bike chain guard is sturdy and durable because it is made from aluminum alloy and nylon, you can use it for a long time. Compact: This lightweight repair accessory is smooth, it will not scratch the bike cover, you can carry it without worrying about taking up so much space. Specification: Material: 7075 aluminum alloy CNC, nylon. Size: show as pictures. Color: red, for purple, gold. Type: approx. 35mm-31.8mm/1.38x1.25inch. Installation: E type. Note: Due to the light and screen difference, the item's color may be slightly different from the pictures. Please allow a slight deviation for the measurement data and make sure you do not mind before ordering. Package Includes: 1 Piece Bicycle Chain Guide(with 4 Pieces Washers, 1 Piece Frame Protector).