For materials up to 3/16 in These carbide tipped sheet metal cutters produce fine, burr-free holes in a variety of materials. They are ideal for stainless steel, structural steel studs and electrical boxes. They can also improve your production in cast iron, brass, aluminum and other thin non-ferrous metals. These cutters are designed to be used in hand held drills to achieve drill press quality holes. The carbide tips stay sharper longer than high-speed steel or bi-metal cutters giving these cutters longer life. Lubrication during drilling extends the life of the carbide cutter. Milwaukee® recommends the use of Hawg Wash cutting fluid for best results. Hawg Wash fluid is available in 16 ounce bottles (49-32-0081). One bottle makes one gallon of lubricating solution. Arbors 49-57-0035 or 49-57-0037 are needed for these cutters.