HSS step drill, especially for cable glands in electrical assembly, perfectly round and cylindrical holes in various diameters, centering, drilling, reaming and deburring in one operation, suitable for use in hand and pillar drills in trade and industry, for sheet metal and plates, profiles and pipes made of steel, brass, copper, aluminum, V2A steel, plastic, wood, etc. up to 3 mm thick. Shank 12 mm Ø. After hardening, additional TiN (titanium nitride) coated surfaces are extremely hard and smooth. Higher cutting speed allows faster work, less wear results in 5 to 10 times longer service life. Design: HSS -TIN, drilling Ømm: 8.0 center drill, 12.5 through hole for PG7/M12, 15.2 through hole for PG9, 18.6 through hole for PG11, 20.4 through hole for PG 13.5, 22.5 through hole for PG 16, 25.8, 28.3 through hole for PG 21, 30.5 core hole for M32, drilling steps: 9. PU: 1.