Greenlee 725-4-1/2 Carbide-Grit Hole Saw, 4-1/2-Inch Long-lasting tungsten carbide-grit delivers extremely clean, smooth cuts through tile, cement board, and other abrasive materials Perfect for cutting holes in Quazite enclosure or hardy board siding for 3-0 box installation Rugged construction for enduring performance Use with Greenlee arbors