Cleveland high-speed steel Aircraft Type C heavy-duty screw machine length drill bit are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Uncoated drill bit feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications. Round shanks allow use with a wide variety of toolholding systems . When run in a counterclockwise direction (right-hand cut) spiral fluted drill bit evacuate chips up and out of the cut to reduce clogging. General purpose drill bit that is used in a variety of applications and materials include austenitic stainless steel, carbon steel, tool steel, die steel, aluminum, iron-based alloys.