The Metabo HSS-R Drill Bits, roll-milled version with a cylindrical, type N, 118deg; cone-shaped tip and shell polished surface. Suitable for drilling in steel, non-ferrous metals, alloyed and non-alloyed cast steel. Up to 900 N/mmsup2; tensile strength. Supplied in a handy metal case and contains the following: Sizes: 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 amp; 10mm.