Monster Tool Company 5/16 60-Deg. 6FL DE Carbide Countersink, 67890, 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: 6, Double End, Right Hand Cut, Included Angle: 60 2-1/8 5/16, Material Base: Carbide, Material Construction: Solid, Finish / Coating:, MPN: 67890, PKG QTY: 1 PC