Features: Elevates your ride with the bike chain tightener, feature a 9 to 1 single speed freewheels for gear ratios across diverses terrains. The unique tail hook barrels axles guide wheel ensures a tight chain, reducing the risk of enhancing your bike's performances. Great for bike enthusiasts seek modifications and a efficient cycling experience. Perfect for competitive event, this chain tightener provide transmission and stable control under demanding conditions. Craft from aluminum alloy, this chain tightener simplifies installation, making it a must having for cyclists repair. Specifications: Materials: Aluminum Alloy Color: Redness/Purpleness/Black/Blue Package Weight: approx.88g Size: approx.7x9x5cm/2.75x3.54x1.96in (More Size Detail, Please See Picture.) Package Includes: 1Pc Bicycles Chain Guide note: Please allow 1-2cm 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!