The Makita D-54075 HSS-R Bit Set, 13 Piece, is suitable for drilling applications in steel and cast-steel alloyed and unalloyed up to 900N/mm² tensile strength. Other materials include: grey cast, malleable cast iron, die-cast metal, iron sinter, nickel-silver, graphite cast iron, short chipping aluminium alloys, bronze, brass and hard plastics. Conforms to DIN 338 Standards. Specifications: Sizes: 1.5, 2, 2.5, 3, 3.2, 3.5, 4, 4.5, 4.8, 5, 5.5, 6 &6.5mm.