Milling is a process of cutting metal to achieve a specific type of shape or surface. C.N.C. (computer-numeric-controlled) milling entails creating an electronic file via CAD (computer-aided design), and then loading that file into a D.N.C. (direct numerical control) computer that feeds the code to the mill and directs the tool. C.N.C. milling allows for the precise creation of intricate designs that might be difficult to execute by hand milling, plus C.N.C. milling virtually guarantees that each design will be repeated exactly the same way, time and time again.