Set includes #1, #2, #3, #4, #5 C'drills. This 5-piece set includes one piece each of the following plain type combined drill with a standard 60 degree included angle. 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.