This Annular Cutter Cobalt 6pc Set can create cylindrical holes, of a depth up to 1 inch, on both ferrous and non-ferrous metals. These cutters are designed with a thin walled hollow design with dual alternating teeth geometry, delivering more efficient and aggressive cutting than traditional hole saws and twist drill bits. Multiple precision cutting edges produce more accurate holes without burring. Premium M2 cobalt high speed steel construction provides superior cutting performance, while our reformulated aluminum additive withstands high temperature for maximum durability. These cutters are suitable for working with cast iron, stainless steel, aluminum, copper, and more. Set comes complete with its own compact storage case.