MaxPower 12580 7" Razor Max Brushcutter Blade Replaces Razor Max JM775 Replaces OEM: razor max Jm777 7" brushcutter blade with 1" center hole Designed for fast and easy cutting of Small trees, heavy brush, thick weeds, grass Designed to operate at maximum 10, 000 RPM Chainsaw Tooth riveted onto blade can be sharpened with a 3/16" chainsaw file