Fit my Husqvarna pole saw perfectly. V-easy to change out - one metric wrench did it. I let the old one go too long and the chain was slipping under heavy load. With the new sprocket, the chain runs faster and with much more cutting speed. Why 4 stars? The price. $40 is unreasonable for the amount of steel present in this item. I also ordered the sprocket for my Husky chain-saw, bigger and heavier and it was $10. If you order this item, prepare for a delay. Jacks had to get it from Husky - took almost a month, but they did keep me advised via E-mail as I waited.