Irwin Tools 30507 7/64-Inch Cobalt 135-Degree, Left Handed-Mechanics Length, Pack of 6 M-42 Cobalt Construction for Durability in abrasive materials 135-Degree Split Point Tip for reduced bit walking Straight shank works in both keyed and key-less drill chucks Left-Hand Turn for drilling out fasteners without tightening down the fastener