Monster Tool Company 3/8 x 1/4 90-Deg. Single FL Carbide Countersink, 67544, Designed for general purpose countersinking, chamfering and deburring in most ferrous and non-ferrous materials, Diameter: 3/8, Number of Flutes: 1, Single End, Right Hand Cut, Included Angle: 90-Degree, Overall Length: 2-1/2, Shank Diameter: 1/4, Material Base: Carbide, Material Construction: Brazed, Finish / Coating: AlTiN, MPN: 67544, PKG QTY: 1 PC