19-piece HSS-G ProBox spiral drill bit set, DIN 338, 135°, 1 mm - 10 mm. Ground drill bit with high precision for solid work on standard tasks with metal. Self-centering drill tip, cross-ground, point angle 135 degrees, active drill approach for perfect centering. Made of HSS steel for fast work. No center punching or pre-drilling is required for diameters up to 10 mm. Diameters: Ø 1 / 1.5 / 2 / 2.5 / 3 / 3.5 / 4 / 4.5 / 5 / 5.5 / 6 / 6.5 / 7 / 7.5 / 8 / 8.5 / 9 / 9.5 / 10 mm. The shank is cylindrical (the shank diameter corresponds to the drill bit diameter). It is used with drill stands and drill screws. The ground HSS spiral drill bit drills into metal with the highest precision. The self-centering drill tip with cross-ground and a point angle of 135 degrees allows for perfect centering without wandering. Thanks to the cross-ground drill tip, center punching or pre-drilling is unnecessary up to 10 mm in diameter. This precision-ground drill bit made of HSS steel drills 40% faster and requires 50% less feed force than conventionally ground HSS drill bits. It is suitable for drilling holes in alloyed and unalloyed steel, cast steel, cast iron, sintered iron, ductile iron, non-ferrous metals, and hard plastics. The ground HSS spiral drill bit is manufactured according to DIN 338. It belongs to drill type N (small side cutting angle) with a 135-degree drill tip and diameter tolerance h8.