Features: 1. Iron and Aluminum: The chainsaw chain tensioner kit is made of premium iron and aluminum materials, which are durable, wear-resistant, and have a long service life. 2. Applicable Models: This tensioner adjustment set is applicable for CS 370, CS 400, CS 4200ES, CS 420ES, CS 450, CS 450P, CS 510, CS 520, CS 530, CS 680, CS 680S, QV 680 chainsaws. 3. Tensioner Repair: These tensioner adjustment kits can bring your chainsaw tensioner back to normal without worrying about twigs being cut off. 4. Practical: These chain tensioner tools are perfect accessories for garden tools, can effectively extend the service life of your chainsaw, with stable performance, and can perfectly match your machine. 5. Part Number: The part numbers of these tensioner adjuster kits are V651000001 V651000011 V203000110 C309000030 V355000800. Specifications: Item Type: Chain Bar Tensioner Adjuster Kit Material: Iron, Aluminum Gross Weight: 36g / 1.3oz Applicable Models: for CS 370, CS 400, CS 4200ES,