Carbide-Tipped Hole Saws designed for sawing holes in abrasive materials such as fiberglass, particleboard and asbestos board. This hole saw offers three teeth per inch, carbide tipped to resist abrasion, with cutting depth of 1-7/8". Carbide is not recommended for ferrous metals but will outlast high-speed steel hole saws in applicable jobs. Available in 48 sizes 3/4"-6. Individually boxed.