Yato YT-4009 Twist HSS-G Drill Bit is a must-have tool that is suitable for professionals or enthusiasts. It is made from high-quality high-speed steel (HSS-G) with a cylindrical handle (Chuck). The working insert is made of high-speed steel (HSS-G). Perfectly built to perform precise drilling in steel, cast iron, metals and plastics in industry and crafts. Drill bit diameter: 1-10 mm. Comes in 19 pieces plastic box.