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HSS step drill, especially for cable glands in electrical assembly, Perfectly round and cylindrical holes in various diameters, centring, spot drilling, reaming and deburring in one operation, suitable for use in hand-held and pillar drilling machines in trade and industry, for sheets and plates, profiles and pipes made of steel, brass, copper, aluminium, V2A steel, plastic, wood, etc. up to 3 mm thick. Shank diameter 12 mm, additional TIN (titanium nitride) coated surfaces are extremely hard and smooth. Higher cutting speed allows faster work, lower wear brings 5 to 10 times longer tool life
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