MA Ford 61B062506, 5/8 HSS UniFlute Countersink,120 Deg, Blaze Coated, Diameter: 5/8, Shank Diameter: 1/4, Overall Length: 2-1/4, Included Angle Degree: 120, Base Material: HSS, Number of Flutes: 1, MPN: 61B062506, PKG QTY: 1 PC, Description: MA Ford Series 61 HSS Uniflute Countersink. The original single flute countersink designed for general purpose countersinking, chamfering or deburring.