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 for extra chain roller is convenient for replacement. Good use performance and fine workmanship, and for stronger built than other tensioners. The chain tensioner widely suitable for adjusting the chain of motorcycle, mini bike and so on. Specifications: Material:Metal+Silicone Size: As Picture Shown Package Includes: 1 Set Chain Tensioner(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.