1. Made of M35 material, includes 5% cobalt, high hardness, stable performance 2. 135-degree split-point tip starts drilling immediately with less force and eliminates 3. Ideal for drilling on stainless steel, cast iron, sheet metal, steel plate, Angle iron 4. With high finish, high grinding precision , the blade is and in use 5. It is widely used in the drilling of stainless steel plate, automobile spring steel and die steel Spec: Descriptions: These drill bits are made of M35 material, includes 5% cobalt, high hardness, stable performance. Cobalt steel extends cutting 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 . Ideal for drilling on stainless steel, cast iron, sheet metal, steel plate, Angle iron. With high finish, high grinding precision , the blade is and in use. It is widely used in the drilling of stainless steel plate, automobile spring steel and die steel Cobalt steel extends cutting 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 lengthTotal lengthWeight(g) 112303 1.518406 2244911 2.5305719 3336130 3.2356535 3.5407044 4437557 4.5438072 5518599 Package included: 10 x M35 Cobalt Drill Bits