Metabo HPT's new fiber cement blade features polycrystalline diamond technology that provides more durability and a longer cutting life than other diamond or carbide tipped blades. The 7-1/4-inch polycrystalline blade is a diamond powder made from graphite, and is the only type that possess self-sharpening properties. This blade is ideal for ripping, crosscutting, and mitering in fiber cement boards and siding.