Cleveland high speed steel Aircraft NAS 907 Type B heavy-duty jobber length drill bit. 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. Round shanks allow use with a wide variety of toolholding systems. When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging. Designed for tougher materials. Applicable for stainless steel, alloy steel, carbon steel, iron-based alloys, aluminum materials.