Forum Step drill HSS 4 -20mm HSS 4-20.00mm

CBN-ground, with 2 cutting edges, cross-bevel, edge breaker, diameter in the groove laser-signed, the special shank prevents slipping in the drill chuck, for burr-free drilling and reaming of sheet metal, pipes and profiles, can be used in materials up to 6 mm wall thickness, straight grooved , for drilling and deburring in one operation, the exact bore diameter results from the cylindrical gradation, the bevel of the next stage deburrs the smaller bore diameter in each case, when drilling in metals, good lubrication with the also available drilling paste is required, surface bare