Diablo HardieBlade is the only approved PCD (Polycrystalline Diamond) tipped fiber cement blade recommended by James Hardie Building Products. Diablo Fiber Cement Blades generate up to 5 percent less respirable dust， while delivering the longest life in all fiber cement materials. Diablo PCD HardieBlades feature a unique， spark-eroded Triple Chip grind for long life up to 60 times the life in fiber cement of conventional carbide blades Diablo PCD HardieBlades are perfect for full time use in heavy duty applications like cutting multiple pieces of fiber cement board. Dust generation does not necessarily correlate directly to exposure risk.