Titanium, Inconel, and duplex stainless steel are examples of materials that are hard to machine and most often used for the production of aerospace as well as energy components. Such applications require very high-rigidity drill bits that have a low level of deviation over the length of the boring, heat resistance.

12mm U drill tools are used in through-spindle coolant systems by several German drilling plants while machining turbine disk hubs and valve seats. Tool life is greatly improved, and only one finishing operation is needed, which leads to a lower cost per part and a more reliable process.