Feature:1. 4241 HIGH SPEED STEEL MATERIAL: Drill bits are made of good quality 4241 high speed steel material, of sharpness and durable2. HIGH CONCENTRICITY: The overall drill bit has high concentricity, and the drilling is more accurate, very practical3. 1/4IN SHANK DIAMETER: 1/4in shank diameter is suitable for a variety of drilling rigs, and a variety of tool diameters can meet a variety of needs4. WIDE RANGE OF APPLICATIONS: HHS drill bit set is suitable for woodworking, etc. as a punching tool, has a wide range of applications5. DRILLING COPPER, BRASS, ALUMINUM: Can be used for drilling holes in copper, brass, aluminum, thin metal plates and plastics, possess high performanceSpecification:Item Type: HHS Drill Bit SetMaterial: High speed steelRod Length: Approx. 60mm / 2.36inShank Diameter(in): 1/4Twist Drill Tool Diameter(in): 3/32, 1/8, 3/16, 1/4, 5/163 Point Drill Tool Diameter(in): 3/32, 1/8, 3/16, 1/4, 5/16, 3/8.Package List:6 x 3 Point Drill5 x Twist Drill1 x Rod1 x Plastic BoxNote:Take good safety protection when using.