High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistanceGold and black surface treated for use in stainless steel and other hard metal drillingRound shanks allow use with a wide variety of toolholding systemsWhen run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce cloggingHeavy duty 135 degree split point KFDRSD Series Drill America Killer Force Reduced Shank Drill Bits are manufactured from premium grade high speed steel, Killer Force Drills have a heavy duty 135° split point for self-centering and reducing thrust. Black and Gold surface treated for use in stainless steel and other hard metal drilling these drills expand the size range capacity of a portable drill chuck. Common flute and overall length for minimal adjustment during tool changes. Precision ground for high degree of concentricity between shank and body diameter. Ideal for drilling in low and medium tensile strength materials