9 out of 10 of my saws use 3/8 - 050 and 404 - 063, but i bought a roll of this 22lgx to spin loops for neighbors and my ms261. My neighbors kind of gave my a funny look when i handed them Oregon chains because they are accustomed to Stihl chains. I told them just give the Oregon chain a fair chance. Well now they are all Oregon chain fans. There is a small difference in quality between Oregon and Stihl, but a huge difference in price. Besides, the life of a chain depends on the person doing the cutting.