VHM 4 x 45 mm TiAIN 50HRC carbide drill bit Diameter 4mm Working length 25mm Total length 45mm CNC PROFI solid carbide drills with TiAiN coating are the highest quality drills, resistant to abrasion and high temperatures. Right spiral with an angle of inclination of 30°.Designed for machining with a hardness of up to 50 HRC. Professional drills are recommended for high-performance drilling processing up to 10 times faster. Designed for:steel and for machining hard-to-cut steels, non-ferrous metals, aluminum, copper, brass.