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 Long