Irwin 5-Piece Black Oxide Metal Countersink Bit Set 1877791

Precision ground 82 tip for countersinking most machinable metals wood or plastic. Made from industrial grade high-speed steel for increased durability. Includes a black oxide finish for added corrosion resistance. 5-flute design reduces vibration for smoother drilling and extended life. 14-in round shank fits all handheld and stationary drills.