toppros Series 1/2inch Shank Drill Bits are manufactured from premium grade high speed steel, have a heavy duty 135° split point for self-centering and reducing thrust. Black 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