The Chain Bar Tensioner Kit is a must-have accessory for your Chainsaw CS-400, CS-400 or CS-450. It's designed to adjust the tension on the chains, ensuring optimal performance and longevity. This kit comes with an easy-to-use adjuster and the necessary hardware to fit your specific model. Simply follow the included instructions to install the new tensioner, and you'll have a chainsaw that cuts with ease and minimizes wear on the chains. This tensioner kit fits as a direct replacement for the OEM tensioner, so you can save money and use a high-quality part from a trusted brand. Invest in this Chain Bar Tensioner Kit today to keep your chainsaw running smoothly and efficiently.