INSTY*DRIVE, 4 Flute w/ HSS Drill Bit INDIVIDUAL
Hex Shank Countersinks, INSTY*DRIVE, 4 Flute w/ HSS Drill Bit Insty-Bit Countersinks make short work of countersinking and counterboring holes in wood for installation of drywall style screws. Choose the required size of countersink by matching the drill to the root diameter of the woodscrew. The jobber length drill bit is adjustable to match the selected screw length. Purchase in a set or individually.