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1-1/2-Inch Diameter x 1-Inch depth of cut M35 cobalt cutter with up to 30-Percent longer life 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, Hi Tensile steel, Stainless Steel, Brass, Aluminum Use coolant or lubrication