5/16 60° – 1 Flute Hyper Countersink • HSS • For Chamfering, deburring, and countersinking • Can also be used to enlarge holes in sheet metal List Number ZD63020 Fractional 5/16 Decimal Equivalent 0.3125 Overall Length 2" Substrate HSS Angle 60° Package Quantity 1 Shank 1/4 Flute Count 1 SKU: ZD63020 Category: Countersinks Related products 1/4 90° – 1 Flute Solid Carbide Countersink Item #: SC08250 1″ 90° – 1 Flute Solid Carbide Countersink Item #: SC08900 1/4 60° – 1 Flute Solid Carbide Countersink Item #: SC08252