13-piece HSS-Co spiral drill bit set, Robust Line, 1.5 mm - 6.5 mm. Suitable for drilling in metal. HSS-Co spiral drill bits with a long lifespan. Cobalt alloy and ground HSS steel ensure wear resistance and heat resistance. Two cutting edges allow for quick removal of chips. Manufactured according to DIN 338 with a point angle of 135 degrees and diameter tolerance h8. Diameters: Ø 1.5 / 2 / 2.5 / 3 / 3.2 / 3.5 / 4 / 4.5 / 4.8 / 5 / 5.5 / 6 / 6.5 mm. The HSS-Co spiral drill bit has a long lifespan when drilling stainless steel. This extended lifespan is ensured by the metal alloy with 5% cobalt content and the fully ground HSS steel with excellent surface quality, wear resistance, and heat protection. The two cutting edges and two spiral flutes quickly remove chips, further extending the lifespan. This drill is suitable for alloyed and unalloyed steel, stainless steel, cast iron, cast steel, as well as acid- and heat-resistant steel. The HSS-Co spiral drill bit is manufactured according to DIN 338. It belongs to drill type N (small side cutting angle) with a 135-degree point and diameter tolerance h8. The drill tip with cross grinding allows for an active drilling approach and perfect centering without wandering. The shank is cylindrical (the shank diameter corresponds to the drill diameter). It is used with drill stands and drill drivers.