Features 4241 HIGH SPEED STEEL MATERIAL: Drill bits are made of good quality 4241 high speed steel material, of sharpness and durable HIGH CONCENTRICITY: The overall drill bit has high concentricity, and the drilling is more accurate, very practical 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 needs WIDE RANGE OF APPLICATIONS: HHS drill bit set is suitable for woodworking, etc. as a punching tool, has a wide range of applications DRILLING COPPER, BRASS, ALUMINUM: Can be used for drilling holes in copper, brass, aluminum, thin metal plates and plastics, possess high performance Specification: Item Type: Drill Bit Set Material: High speed steel Rod Length: Approx. 60mm / 2.36in Shank Diameter(in): 1/4 Twist Drill Tool Diameter(in): 3/32, 1/8, 3/16, 1/4, 5/16 3 Point Drill Tool Diameter(in): 3/32, 1/8, 3/16, 1/4, 5/16, 3/8 Package List: 6 x 3 Point Drill 5 x Twist Drill 1 x Rod 1 x Plastic Box Note: Take good safety protection when using. Package List 6 x 3 Point Drill 5 x Twist Drill 1 x Rod 1 x Plastic Box