Features: Made of high-quality metal material, sturdy and strong, have longer service life. Chain roller tensioner ensures proper tension and alignment of the chain. It can prevent the chain from derailing, excessive wear of the sprocket. Easy to install. The tensioner has stable structure, ao it is convenient to install, and the extra chain roller is convenient for replacement. Good use performance and fine workmanship, and stronger built than other tensioners. The chain tensioner widely suitable for adjusting the chain of motorcycle, mini bike and so on. Package Includes: 1 Set Chain Tensioner(As Picture Shown) Specifications: Material:Metal+Silicone Size: As Picture Shown note: Please allow 1-2cm errors due to manual measurement. Because of the different display of each computer, the pictures may not reflect the actual color of the item.