The NPD40-M42-100-25 Omega Technologies Cobalt Nutplate Drill was given the name because they are used in nutplate pneumatic drill motors. Omega Technologies Nutplate Drill Countersinks are available in high speed steel or in cobalt. Standard Nutplate Drill Countersinks are made of M7 High Speed Steel and are used for drilling aluminum and mild steel, while M42 Cobalt Nutplate Drill Countersinks are used for drilling hard steel or titanium. These units combine Nutplate Drill Jugs and Nutplate Drills to drill consistent, properly drilled and countersunk holes. Omega Technologies Nutplate Drill Countersinks are machine specific and are used with Nutplate Jigs to produce a high volume of holes that are to size. Omega Technologies Nutplate Drills will easily start a hole in difficult to machine materials.