The Greenlee 725-4-1/2 Carbide Grit holesaw Bit (4-1/2") is part of Greenlee's premium collection of tools and accessories. This hole-saw features a long-lasting tungsten carbide-grit that deliers extremely clean, smooth cuts through tile, cement board, and other abrasive materials. It's rugged construction is designed for enduring performance, and it is made to be used with arbors.