MA Ford 78037503 3/8 6-FLute, Chatterless Carbide Countersink 90-Degree, Diameter: 3/8, Shank Diameter: 1/4, Overall Length: 2, Included Angle Degree: 90, Base Material: Carbide (steel shanks on tools 3/8 diameter and larger), Number of Flutes: 6, MPN: 78037503, PKG QTY: 1 PC