13 Piece Drill Set 1.5 to 6.5-5% cobalt

These drill bits are high speed steel and contain 5% cobalt that gives them extra strength This HSS Drill set has 13 drill bits in a convenient package each drill is made of high speed steel and this brand has 5% cobalt which gives extra strength to an already strong dril bit. 1.5mm 2mm 2.5mm 3mm 3.2mm 3.5mm 4mm 4.5mm 4.8mm 5mm 5.5mm 6mm 6.5mm