Key Features Tapered drill with widened flutes for drilling fast, clean pilot holes Adjustable four-cutter counterbore cuts and clears chips quicker for fast, smooth countersinking Counterbore attaches to flats on shank with two hex screws for a secure fit and can be adjusted for controlled pilot hole depth 1/4 in quick-change shank reduces slipping in standard chucks and is compatible with all 1/4 in quick-change chucks, including impact drills #14 1/4 Inch Replacement Bit for Wood Countersink. Tapered drill with widened flutes for drilling fast, clean pilot holes. 1/4 inch quick change shank reduces slipping in standard chucks and is compatible with all 1/4 inch quick change chucks, including impact drills. Adjustable four-cutter counterbore cuts and clears chips quicker for fast, smooth countersinking. Counter bore attaches to flats on shank with two hex screws for a secure fit and can be adjusted for controlled pilot hole depth.