Designs for quick and easy setups, requiring only a few simple steps to install with not need for special tool This bicycles single speed chain tensioner effectively prevents chain derailments, maintaining stable tension With the ability to easily adjust the chain ' s tension, this bike 1 speed Derailleurs chain Checker guide keep the chain in the perfectly position, providing a stable and efficient drivetrains Engineered to minimize frictions and noise between the chain and the sprocket, this single speed Derailleurs chain tensioner ensures a smooth, quieter ride Make from aluminum Alloys, perfectly durability and strength, ensuring long terms and resistance to wear