A U drill is a type of drill that uses carbide inserts. These inserts are easy to replace and are cost-effective. U drills are also called shallow hole drills. They are used in CNC machining centers and high-speed machining applications. They are used to embed heat pipes and make deeper holes or cavities through axial cuts.
U drills are different from ordinary drills because they use blades, including a peripheral blade and a center blade. They are used in CNC lathes and special purpose machines.