Item Type: Spiral Step Drill Bit <br>Material: High Speed Steel <br>Cover Treatment: Titanize <br>Handle Type: Hex Handle <br>Handle Diameter: Approx. 6.35mm / 0.3in <br>Drillable Diameter (mm): <br>Approx. 4mm / 0.2in <br>Approx. 6mm / 0.23in <br>Approx. 8mm / 0.31in <br>Approx. 10mm / 0.4in <br>Approx. 12mm / 0.5in <br>Drillable Thickness: <br>Approx. 2mm / 0.08in Thin Iron (Hardness within 25°) <br>Approx. 2mm / 0.08in Copper Plate or Aluminum Plate <br>Approx. 5mm / 0.2in Wood Plate or Plastic <br>Angle: 118°<br>1、Durable: Made of strong M35 high speed steel and added with 5% cobalt to form a hardened heat resistant alloy, with faster cutting speed and longer service life <br>2、Accurate Positioning: 118 ° X shaped opening design for more accurate positioning and effectively reduce bit slip <br>3、Hex Shank Design: Hex handle design, not easy to slip, more firm and more durable <br>4、Application: Can drill 2mm thin iron (hardness within 25 degrees), 2mm copper plate or aluminum plate, 5mm wood plate or plastic plate <br>5、Specification : The diameter of the handle is 6.35mm, and the diameter of 4mm, 6mm, 8mm, 10mm and 12mm can be drilledPlease allow 0 to 2 cm error due to manual measurement. Thanks for your understanding.1 x Spiral Step Drill Bit