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 to high speed steel with a titanium coating 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. Product Description Unique step design 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 Precisely drill holes of different sizes, from 4mm to 32mm in diameter, with optimal speed and precision. Easily identify the size you need with the contrasting, laser-etched sizes inside the bit flute. HSS and Titanium Coated Our step drill bits are made from super strong HSS steel