Drilling a cabinet / enclosure door to install Rotary handles for instance, is a tricky job; one time out of 2 your hole is misaligned, and the only thing you can do is scrap the door and try again with a new one ! (provided you don’t have a 2 weeks lead time to get a new one…)
now with this new tool from Schneider Electric, things are made simple ! see video below with Tesys U range
http://youtu.be/4PjuMNG7Svc