Unibor 24122 Diameter Annular Cutter, Bright Finish, 11/16-Inch, 1-Pack 11/16-Inch Diameter x 1-Inch depth of cut M2 high speed cutter HSS Standard 3/4-Inch shank with 2 flats at 90-Degree to fit most magnetic drills Unique geometry provides faster feeds, less friction and a smooth hole finish in various materials - Mild steel, Brass, Aluminum Use coolant or lubrication