The Lenox Tools 20097195CHCCarbide Tipped Hole Cutter-19.5CHC 1-7/32-Inch or 31MM is designed specifically for Sheet metal Hole Cutting. The Carbide hole cutter provides accurate, burr-free holes through the use of precision ground carbide teeth. The cutter also features an over-drill stopper to prevent the tool from penetrating beyond the whole. The Split point pilot bit starts on contact for faster penetration and less walking