The step drills allow you to make smooth, neat and burr-free holes in sheet metal and plastic materials. Thanks to their high-speed and high-strength steel, these drills can even drill through hard and valuable metals such as copper, brass and others. Drill bits will help to drill metal profile, pipes and other building materials. Since the drill bits have an external coating of titanium nitride, they perfectly tolerate heat and have an increased service life. The set includes 3 step drill bits: 12, 20 and 32 mm.