This chain adjuster tensioner is perfect for Stihl chainsaws. It is compatible with the 028 and 038 models and comes in a pack of one. The part number for this item is 1118 664 1600 and it is used but still fully functional. This chain adjuster is ideal for those who want to keep their Stihl chainsaw running smoothly without having to worry about the tension. Whether you're a professional landscaper or just someone who wants to keep their yard looking neat and tidy, this chain adjuster is a must-have accessory.please see pics, and thanks for looking!