Ambore Mighty Bite Silver and Deming Drill, Series 1458, 12 in Drill Size Fraction, 05 in Drill Size Decimal Inch, 4516 in Overall Length, 178 in Cutting Depth, 4 Flutes, 178 in Flute Length, 12 in Shank, 3Flat Reduced Shank, HSS Cutting Edge, HSS, BlackGold