This drill bit is the new HSS Steel Large Step Cone Drill Bit Set Cutter Titanium Hole, which is made from high quality HSS steel, and with titanium coated to reduce friction and heat It is very suitable to Use for drilling holes in a variety of materials including steel, brass, wood, plastic, etc. Made from M42 high speed steel with a coating of titanium to reduce friction and heat. No pilot holes or pre-drilling required. Automatically deburrs holes as you drill. Best for thin metals, steel, aluminum, copper, brass, fiberglass, PVC, etc. Unique step design br/> This drill bit can be used to open holes of different sizes, i.e. the equivalent of a box of drill bits. which are designed to drill accurately holes of different sizes, from 4 mm to 32 mm in diameter, with optimal speed and precision. Easily identify the size you need with the contrasting, laser-etched sizes inside the bit flute.