Cleveland high speed steel heavy-duty screw machine length drill bit set. High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Uncoated tools feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications. Applicable for austenmc stainless steel, carbon steel, tool steel, die steel, aluminum, iron based alloys. Set includes 1/16 inches - 1/2 inches drill bits.