Monster Tool Company 5/16 x 1/4 82-Deg. 6FL Carbide Countersink, 67832, Designed for general purpose countersinking, chamfering and deburring in most ferrous and non-ferrous materials, Diameter: 5/16, Number of Flutes: 6, Single End, Right Hand Cut, Included Angle: 82 2 1/4, Material Base: Carbide, Material Construction: Brazed, Finish / Coating:, MPN: 67832, PKG QTY: 1 PC