RUKO Step Drill Bit HSS | 4.0-39 mm, 5, 13-Steps

Step drill bit HSS (High Speed Steel) ground with CBN method, spiral flute and split point - standard: DIN 1412 C. Depth ground spiral flute provides high cutting-edge performance. The chip flow is optimized, so even long, non-breaking chips will be removed easily. The optimized chip flow protects the cutting edges and reduces built-up edges and cold weld marks. Conical shape allows easier withdrawal of the tool from the material.