This powerful saw has a larger 6-1/2" diameter blade that can undercut doors in place, and comes with a masonry blade for undercutting hearths. A diamond blade (No. 822) is available for undercutting tile and stone. Other enhanced features include a more powerful, lower RPM motor that throws less dust, dust control port, threaded rod height adjustment that will not slip, and rugged aluminum ratchet handle. Undercuts almost everywhere, including inside corners. Guaranteed for one year.