Freud's 5" x 4T Diablo Fiber Cement Hardie Blade (D0504DHA) is durable and built to resist the abrasiveness of all fiber cement materials. It is the only approved PCD tipped fiber cement blade recommended by James Hardie Building Products. They feature a spark-eroded triple chip grind which gives them 60 times longer blade life than traditional carbide blades. They are perfect for heavy duty use such as cutting multiple pieces of fiber cement board. Diablo Fiber Cement Blades also produce up to 5 percent less respirable dust.