Concrete Grinding Blocks For Edco and Husqvarna Floor Grinders Designed to remove floor coatings, smooth rough surfaces, level high spots and remove surface imperfections in concrete or terrazzo floors 4 large segments (50x10x13 mm) with coarse grit diamonds provideaggressive grinding and fast stock removal The backing block and wooden wedge to securely fasten and align the blocks on your machine.Those blocks provide superior grinding speed and life. Fits Edco, Husqvarna floor grinders. 3 piece set using #30/40 diamond grit