Irwin 0 - 3/16" Wood Countersink features tapered drill bits with widened flutes designed to drill fast, clean pilot holes efficiently. Its adjustable 4-cutter counterbore cuts and clears chips quickly, allowing for smooth and speedy countersink or counterbore drilling. The counterbore attaches securely to the flat on the shank and adjusts easily with two hex screws for a reliable fit. An adjustable stop collar on the counterbore enables precise control of countersink depth. The 1/4" hex quick change shank minimizes slipping in standard chucks and is compatible with impact drivers, making this tool versatile and user-friendly. Model Number: