HSS PRO is an industrial quality twist drill with outstanding performance and long service life. It is 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. It requires lower feed pressure than standard HSS drill bits with a chisel edge. HIGHLY ACCURATE - Close tolerances and high concentricity for maximum precision. HIGHEST STEEL GRADE - High-performance, High-Speed Steel.