Irwin HSS Pro Drill Bit Set 19 Piece set, are designed for toughness and precision, for professional use. They offer industrial quality with outstanding performance and a long service life. The drill bits are suitable for drilling steel and steel castings, alloyed and non-alloyed steel, cast iron, non-ferrous materials, plastics and other materials. The 118° split point shap provides optimum centring when starting and a faster drilling rate. This Irwin 19 piece HSS Pro Drill Bit Set contains the following sizes: 1, 1.5, 2, 2., 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 and 10mm. Supplied in a hard metal storage case.