Features: This bicycles single speed chain tensioner effectively prevents chain derailments, maintaining stable tension. Engineered to minimize frictions and noise between the chain and the sprocket, this single speed Derailleurs chain tensioner ensures a smooth, quieter ride. Designs for quick and easy setups, requiring only a few simple steps to install with not need for special tool. 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. Make from aluminum Alloys, offers perfectly durability and strength, ensuring long terms performances and resistance to wear. Specifications: Materials: Aluminum Alloys Style: ZLQ01/ZLQ02 Size: about 58.5x110mm/2.30x4.33inch Package Includes: 1Pc Bike Single Speed Chain Tensioner note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.