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 on stainless 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 on stainless steel, cast iron, sheet metal, steel plate, Angle iron. With high surface finish, high grinding precision , the blade is sharp and durable in use. It is widely used in the drilling of stainless steel plate, automobile spring steel and die steel Cobalt steel extends cutting edge life and maintains cutting life after resharpening Specifications: Material: HSS CO/M35 Drill bit size(Optional):1.0, 1.5mm, 2mm, 2.5mm, 3.0mm, 3.2mm, 3.5mm, 4mm, 4.5mm, 5mm Quantity:10 Specification(mm) Working length Total length Weight(g) 1 12 30 3 1.5 18 40 6 2 24 49 11 2.5 30 57 19 3 33 61 30 3.2 35 65 35 3.5 40 70 44 4 43 75 57 4.5 43 80 72 5 51 85 99 Package included: 10 x M35 Cobalt Drill Bits 1Made of M35 material, includes 5% cobalt, high hardness, stable performance 2135-degree split-point tip starts drilling immediately with less force and eliminates 3Ideal for drilling on stainless steel, cast iron, sheet metal, steel plate, Angle iron 4With high surface finish, high grinding precision , the blade is sharp and durable in use 5It is widely used in the drilling of stainless steel plate, automobile spring steel and die steel