The Rotabroach Sheet Metal Hole Cutter Combo Kit features both a small and large diameter kit in one convenient package. It includes 13 sizes of Rotabroach sheet metal cutters, which can drill holes in materials up to a quarter- or half-inch thick. The kit also contains two arbor assemblies, extra pilots, center punch, washers and instructions. The cutters can be used in most hand-held electric drills and in drill presses.