This Universal metal drill bit set comes with 25 pieces and can be used with metal, plastic and wood Universal Metal Drill Bit Set includes 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.2mm, 3.5mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 11mm, 12mm and 13mm bits Roll forged high speed steel with polished finish for accurate drilling Metal Drill Bit Set has a 135 degree split point blade tip type