RLECS Bicycle Chain Adjuster 2PCS Adjustable Chain Buckle Bicycle Wheel Fixing Button Zipper Chain Tensioner Chain Adjuster for Dead Fly Bicycles Folding Bicycles and Mountain Bikes

Floating pulleys and spring adjustment device realize perfect chain tension., Made of high-end high-quality steel, wear-resistant when used., Light weight and small size: very light and easy to install., Very suitable for mountain bikes, bicycles, BMX, etc., Single speed inverter for chain tensioner.