20 High Speed Twist Drill Bits Great for Metalsmiths, Metal Working & Drilling The is a new set of 20 high speed steel twist drill bits Great for drilling ferrous metals, tough casting sand forgings, working hardened stainless steel and other hard steels and tough high tensile strength nonferrous metals like titanium These bits are sizes #61 to #80 Newer versions of the item shown may be shipped, as a result, there may be a slight variation in color and design.