General description This set of three conical drill bits is well-constructed and allows you to achieve the desired drilling diameter without the need to change bits multiple times. Made from high-quality HSS steel and coated with titanium, these bits reduce friction and heat, making them ideal for a wide range of materials including metals, aluminum, wood, plastics, and more. Technical specifications Material: Titanium-coated 4241 HSS (High-Speed Steel) Sizes: 4-12 mm, 4-20 mm, 4-32 mm Usage Suitable for drilling through thin metal, aluminum, copper, brass, PVC, and more. Allows for macroprocessing of holes of different diameters without changing the drill bit.