Helical Solutions 83778 Drill Mills; Mill Diameter (Inch): 1/2; Mill Diameter (Decimal Inch): 0.5000; Length of Cut (Inch): 1; Number Of Flutes: 4; End Mill Material: Solid Carbide; Shank Diameter (Inch): 1/2; Shank Diameter (Decimal Inch): 0.5000; P