Monster Tool Company 1/2 x 3/8 100-Deg. Single FL Carbide Countersink, 75178, Designed for general purpose countersinking, chamfering and deburring in most ferrous and non-ferrous materials, Diameter: 1/2, Number of Flutes: 1, Single End, Right Hand Cut, Included Angle: 100-Degree, Overall Length: 2-3/4, Shank Diameter: 3/8, Material Base: Carbide, Material Construction: Brazed, Finish / Coating: Uncoated, MPN: 75178, PKG QTY: 1 PC