TIMBERLINE 640-270 by Amana SINTERED TURBO FLAT 12" DIAMETERThese blades are sintered with a serrated cutting edge to stay inconstant contact with the material and produce a smoother cut than thesegmented blades. They have a longer life than the continuous rimblades. Designed to cut: Concrete, Brick, Pavers, Slate, Granite and Marble