DIN 338 Titan. The drills are made of high-quality high-speed steel (HSS) and coated with 2.5 microns of titanium nitride. The TIN coating hardens the surface to up to 80 HRC and is wear resistant. The TIN coating reduces friction, allowing the drill to operate faster and heat up less. The 135° double drill sharpening provides higher speed and easier drill centering. It is recommended for drilling materials with a strength limit of up to 1000 N/mm².