Descriptions:These drill bits are made of M35 material, includes 5% cobalt, high hardness, stable performance. Cobalt steel extends cutting edge life and maintains cutting life after resharpening Ideal for drilling onstainless steel, cast iron, sheet metal, steel plate, Angle iron.Features:Made of M35 material, includes 5% cobalt, high hardness, stable performance.135-degree split-point tip starts drilling immediately with less force and eliminates "walking" across the work surface.Ideal for drilling onstainless steel, cast iron, sheet metal, steel plate, Angle iron.With highsurface finish, highgrinding precision , the blade is sharp and durable in use.It is widely used in the drilling of stainless steelplate, automobile spring steel and die steelCobalt steel extends cutting edge life and maintains cutting life after resharpening Specifications:Material: HSS CO/M35Drill bit size(Optional):1.0, 1.5mm, 2mm, 2.5mm, 3.0mm, 3.2mm, 3.5mm, 4mm, 4.5mm, 5mmQuantity:10Specification(mm)Working lengthTotal lengthWeight(g)1123031.51840622449112.530571933361303.23565353.540704444375574.54380725518599Package included:10 x M35 Cobalt Drill Bits