Fits the 880F4/890F4 Hydraulic Concrete Chainsaw with the 529829 10in F4 guide bar or the 633F4/695F4 12in Gas Concrete Chain Saw with 553208 12in F4 guide bar. These new chains provide longer side-clearance life and improved tracking in the cut. Delivering longer life in hard aggregate, this is the best choice when faced with the more demanding jobs.