This Irwin® 10502500 HSS Pro is an industrial quality 19-piece twist Drill Bit Set with outstanding performance and long service life. They are designed for drilling steel and steel castings, alloyed and non-alloyed steel, cast iron, non-ferrous metals, plastics, and other materials.The 118° split point shape provides an optimum centering when starting and a faster drilling rate. There is no need to pre-punch or use a pilot drill they penetrate quickly and require little effort or feed pressure. The bits are highly accurate, and are made from high-performance high-speed steel. Set of 19 HSS Pro Drill Bits: 1, 1.5, 2, 2.5, 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 metal case.    Additional Information:• Pack Qty.: 19