The Chain Adjuster Tensioner is designed by Farmertec for STIHL chainsaws, specifically compatible with models like MS260, 024, MS360, MS361, MS440, MS660, and 066. This 2-stroke engine part is essential for maintaining proper tension in the chainsaw chain. As a gasoline-powered component, this tensioner comes as a single pack and does not require assembly. It is a crucial replacement part for ensuring the smooth operation of compatible STIHL chainsaws during cutting and trimming tasks.