Monster Tool Company 5/16 90-Deg. 4FL DE Carbide Countersink, 67740, Designed for general purpose countersinking, chamfering and deburring in most ferrous and non-ferrous materials. Economical double cutting ends., Diameter: 5/16, Number of Flutes: 4, Double End, Right Hand Cut, Included Angle: 90 2-1/8 5/16, Material Base: Carbide, Material Construction: Solid, Finish / Coating:, MPN: 67740, PKG QTY: 1 PC