Material: Titanium Coating 4241 (HSS) high speed steel. This set of three conical drills is very well constructed and allows you to achieve the desired drill diameter without changing drills several times. Depending on the need to process holes of different diameters, a disposable macroprocessing can be performed without having to replace the drill and position the holes. 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. Ideal for a wide range of materials, openings and bore, including metals, aluminum, wood, plastics and more. It can be used for thin metal, aluminum, copper, brass, PVC, etc.