BOARD-PRO PLUS Diamond - fiber cement board saw blade 7-1/4x5 BP-18505. 7-1/4" dia. x 5 teeth. 5/8" knockout arbor, .091" kerf, FTG grind, 12 degree hook. For single/stacked sheets. BOARD-PRO PLUS series is the best choice for long lasting performance when cutting fiber-cement board. Fiber-cement board is a very abrasive material that wears down normal carbide very quickly. Board-pro plus has the latest technology PCD (poly-crystalline diamond) for extended cutting life- especially for thick (stacked) material. PCD tips produce a smoother cut. Thicker plate on PCD for longer life. Perfectly-tensioned, hardened-tool steel plates for flat, true run. Extra long blade life. Lower cost per cut! Less dust than traditional blades produce. Tenryu puts a great deal of care in manufacturing their saw blades to ensure every blade is of the highest quality. See our article on making Tenryu Saw blades.