Description: MaterialThis bike chain tensioner is made of aluminum alloy and stainless steel material, which is lightweight, rustproof, durable and not easy to damage, making it suitable for long term outdoor cycling.DeisgnThis bicycle chain adjuster can change multi speeds bikes into single speed bike, prevent the chain from slipping, adjustable design provides stronger tension for your chain to make you pedal with less effort.FeatureBicycle chain stabilizer with double guide wheel design, up and down structure for added stability, can effectively prevent the chain from falling off due to instability during riding.Easy InstallationThe single speed chain adjuster tensioner is easy to use and install, light in weight, and is a good accessory for bicycle lovers.ApplicationThe bicycle chain tensioner perfect bike accessories can be used for mountain bikes, road bikes, fixed bicycles, folding bicycles, etc. Specification: Material: Aluminum Alloy Stainless Steel Size Chart: 10cmx6.4cmx2.65cm/3.94inchx2.52inchx1.04inch Package Includes: 5 Base Gaskets 1 Flywheel Cover 1 Flywheel 1 Chain Tensioner 3 Wrenches 1 Chain Adjuster Note: Please allow slightly errors due to manual measurement and different monitors.