Feature:1. Forged with M35 cobalt‑containing steel, head quenched and heat treated, high hardness and good wear resistance.2. With 130° drill point and double relief angle design, the cutter head can cut sharper.3. Accurate grinding technology, good wear resistance, strong and durable, has a long service life.4. Reasonable 38°large vortex angle design, enlarged chip flute, glossy and flat high temperature non‑stick knife.5. Round shank chamfer design, clear steel stamp marking size, easy to distinguish drill diameter when using.Specification:Item Type: Twist Drill Bit SetMaterial: M35 cobalt steelPurpose: Drilling stainless steel, die steel, aluminum alloy, high carbon steel, cast iron, woodPoint Angle: 130°Product Specifications (mm): 1/1.5/2/2.5/3/3.5/4/4.5/5/5.5/6/6.5/7/7.5/8/8.5/9/9.5/10Size: Approx. 1mm / 0.04in1.5mm / 0.06in2mm / 0.08in2.5mm / 0.1in3mm / 0.12in3.5mm / 0.14in4mm / 0.16in4.5mm / 0.18in5mm / 0.2in5.5mm / 0.22in6mm / 0.24in6.5mm / 0.26in7mm / 0.28in7.5mm / 0.3in8mm / 0.31in8.5mm / 0.33in9mm / 0.35in9.5mm / 0.37in10mm / 0.4in Package List:19 x Twist Drill1 x Plastic Box