Drill Bit Type Die Drill Bit Drill Bit Size Inch 1164 Drill Bit Material Solid Carbide Drill Bit FinishCoating Black Oxide Overall Length Inch 312 Through Coolant No Designed specially for drilling hardened ferrous materials in the range of 45 to 65 HRC Negative angle cutting edge for extra strength drilling hardened steel Produces reamer like hole size and finish Can be used for coring out preexisting holes