HSS Carbide Micro Mini Drill Bits Jewelers Tools New 5 Assorted Twist Drill Bits. This a new set of 5 assorted twist drill bits. Great for drilling all kinds of wood and metal. They can be used with a Dremel tool. Each measures approximately 1/8" in diameter 4 New High Speed Twist Drill Bits Great For Metalsmiths, Metal Working & Drilling. This is a new set of 4 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. High speed steel will not lose temper due to excessive heat. They can be used with a Dremel tool. These bits measure approximately 3/64", 1/16", 5/64" and 3/32".