New 10 High Speed Twist Drill Bits Great For Metal smiths, Metal Working & Drilling. This is a new set of ten #50 assorted 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 will not lose their hardness with excessive heat build upEach has a 1/16" shank We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.