I used this blade to undercut a fireplace hearth for installation of a hardwood floor. It worked great in the SuperSaw (rented from Hiome Depot with only the standard blade, so we had to buy this special diamond blade, which Home Depot does not sell) which seems to be the only tool available to cut flush with the floor (with its recessed center screw). We cut through the concrete flush with the sub-floor and then another cut in the brick 3/4 inches above the sub-floor, both cuts about 3/4" deep, and then... more info
