5/16 100° – 1 Flute Hyper Countersink • HSS • For Chamfering, deburring, and countersinking • Can also be used to enlarge holes in sheet metal List Number ZD63320 Fractional 5/16 Decimal Equivalent 0.3125 Overall Length 2" Substrate HSS Angle 100° Package Quantity 1 Shank 1/4 Flute Count 1 SKU: ZD63320 Category: Countersinks Related products 1″ 90° – 1 Flute Solid Carbide Countersink Item #: SC08900 5/8 90° – 1 Flute Solid Carbide Countersink Item #: SC08625 1/4 60° – 1 Flute Solid Carbide Countersink Item #: SC08252