The CRL Electro-Formed Diamond Drill has a thin-wall, with a 1/2" (12.7 mm) deep multi-layer of diamonds and bonding matrix. This drill is designed for high speed, high production drilling and produces outstanding results when exacting conditions are met. Due to the fragile nature of this type of drill, it should be used only in a precision machine, never allowing too much pressure to be applied. It is important to handle the drill with care and use on flat surfaces only. It features habit, tapered style mounting threads which are popular among all British and Australian glass drilling machines.