1.Good durability: made of wearresistant and corrosionresistant aluminium alloy material, this bicycle chain tensioner provides a sturdy and strong structure with high durability and ensures a long life of your bicycle chain 2.EXCELLENT CRAFTSMANSHIP This chain tensioner features anodized color and lightweight design with just one screw. It does not oxidize easily and ensures durability and a vibrant appearance with split zip double holes 3.PREVENT FRAME SCRATCHES Ensure smooth and rides with this bike chain tensioner. Its extremely practical design prevents scratching of the frame, tangling of the chain and the chain from falling off. The adjustable function provides a simple and effective way to tension a single speed system 4.QUICK SET UP With an easy and quick installation process that doesn't require complicated tools, get your bikes running in no time. Easily adjust your chain to ensure a smoother ride