This Lenox 2011448CHC is a 3" Carbide Hole Cutter. It features precision-ground carbide teeth that quickly product clean round holes on sheet metal. This hole cutter will retain its efficiency and sharpness, one application after another. An over-drill stopper is integrated with this tool to prevent the tool from drilling through. For efficient and precise hole cutting, this carbide hole cutter is designed with a split point pilot bit that secures the tool in place (less walking) while drilling. This diamond hole saw is one of Lenox's reliable tools that can give you the convenience you need without spending a lot of money and effort.