Makita D-54097 25 Piece Drill Bit HSS-R Metal Drill Bit Set Storage Tin 1-13mm Highly efficient HSS-R drill bits suitable for drilling applications in steel and cast-steel alloyed and unalloyed up to 900N/mm tensile strength, grey cast,malleable cast iron, die-cast metal, iron sinter, nickel-silver, graphite cast iron, short chipping aluminium alloys, bronze, brass and hard plastics. HSS-R 25pcs metal box setsizes included : 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 / 10 / 10.5 / 11 / 11.5 / 12 / 12.5 / 13mm Features and Benefits: Suitable for drilling steel up to a tensile strength of 900 N/mm , non-ferrous metals, cast iron, hard plastics etc. High rotational precision. Right-hand cutting twist drill bit. Shank equal to drill bit diameter.