Set of 3 HSS Stainless Steel Metal Countersink Drill Bits 4-12/20/32mm Tapered Titanium Triangle with Hex Shank for Screwdriver Drilling in Steel Brass Wood Plastic 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. For drilling holes in various materials. made of materials such as steel, brass, wood, plastic, etc. Manufactured à from M42 to; High speed steel blade with titanium coating to reduce friction and heat. No pre-drilling or pilot drilling required. Automatically deburrs holes as you drill. Best for thin metals, steel, aluminum, copper, brass, fiberglass, PVC, etc. Design Unique Steps This drill bit can be used to open holes of different sizes, that is the equivalent of a box of drill bits. which are designed to accurately drill holes of different sizes from 4mm to 32mm diameter, with optimal speed and precision. The contrasting,