Chain Tensioners modify slackness in the chain to enable continuous and proper chain procedure.
The 
arm style chain tensioner may be the one that is mostly used . It has a ARM STYLE ROLLER CHAIN TENSIONER proven performance and can be configured for every application. We provide a complete type of these style tensioners for both roller chains as well as belts, our arm style chain tensioners are manufactured in China using top of the line components and materials.