This drill bit is the new HSS Steel Large Step Cone Drill Bit Set Cutter Titanium Hole which is made in China. à Made of high quality HSS steel and coated with titanium to reduce friction and heat It is very suitable for use in high quality HSS steel. For drilling holes in various materials. made of materials such as steel, brass, wood, plastic, etc. Made à from M42 to; high speed steel with 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. Unique stepped design This drill bit can be used to open holes of different sizes, that is, the equivalent of a box of drill bits. designed to accurately drill holes of different sizes from 4mm to 32mm diameter, with optimal speed and precision. The contrasting, laser engraved sizes allow you to easily identify the size you need. within the groove of the drill bit. NOTE: When using these drill