Replacement 6-1/2 in Dia masonry blade for Crain #800 Super Saw, #810 Super Saw, #812 Super Saw, #820 heavy-duty undercut saw, #825 heavy-duty undercut saw. This is a dry abrasive cutting composition blade for use in undercutting masonry walls or hearths. Produces approximately 7 to 10 ft of undercutting depending on material and depth of cut. For use in undercutting masonry materials only. Net weight 6 oz.