Hex Shank Countersinks, with Pilot, 1 Flute

Our pilot countersinks make short work of countersinking and counterboring holes in wood for installation of drywall style woodscrews. Choose the required size of countersink by matching the drill size to the root diameter (base of threads) of the selected woodscrew. Use a somewhat smaller size when working with softwoods. The jobbers length, high-speed steel twist drill is adjustable to match the selected screw length. Purchase individually or as a set.