The TriLink Saw Chain Chainsaw Scrench for chainsaws offers a versatile 3-in-1 tool that can be used to maintain the quality of your saw. The chainsaw scrench works with Poulan, Husqvarna, Stihl, Echo, Homelite, and additional chainsaw brands and models. Quickly loosen and tighten your chainsaw's guide bar nuts with this chainsaw scrench to easily replace your guide bar, spark plugs, or make field adjustments. The weather-resistant solid metal design of the chainsaw scrench provides a perfect tool for all environments. The flat head screwdriver assists with adjusting the chain's tension by locating the tension screw near the base of the guide bar. A properly tensioned chain will fit snug in your guide bar while still being able to be pulled outward freely, exposing one or two drive links. Once released, if tensioned properly, your chain will snap back into the guide bar groove; it's proper position. Get the job done right with this chainsaw scrench!