Milwaukee Step Drill & Metal Thunderweb Set.
This 10 piece set includes a combo of step drills and drill bits, and is suitable for a variety of trades - including electrical, plumbing, metal work, automotives and maintenance repairs. It features step drills, which are ideal for drilling into materials such as copper, brass, stainless steel and plastics. Step drill bits also have a number of advantages over conventional drill bits - they are more durable, more accurate and provide much cleaner holes.