Ma MISS is an infrared spectrometer located inside the core drill. The chuck allows different types of core drill shafts (shanks) to fit in it. Simon reaches for his Core Drill and finds it missing. The biggest advantage of HSS core drill is its ability to re-sharpen. A Standard TCT core drill has tungsten carbide tips. A bit used to enlarge an existing hole is called a core drill bit. The core drill was developed in ancient Egypt by 3000 BC. The term core drill bit is used for two quite different tools. A core drill due to its hollow geometry can only make through holes. A diamond core drill bit is intended to cut an annular hole in the workpiece. A core drill bit may be used to double the size of a hole. Gimmy and Darry use Simon's Core Drill to become the new pilots of Gurren Lagann. A core drill is considered to be 3 to 4 times faster than twist drills. While, re-grinding the TCT core drill is possible but very difficult and time consuming.