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HSS TiN step drill bit set, 3-20 mm, Hex, 3 pcs. 08-948 by NEO TOOLS is a set of three step drills made of durable TiN-coated HSS high-speed steel. The tools have a handle with ¼" HEX fixing. The drill bits are characterised by their diameters: 3-12 (with steps: 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 mm), 4-12 mm (with steps: 4, 6, 8, 10, 12 mm) and 4-20 mm (with steps: 4, 6, 8, 10, 12, 14, 16, 18, 20 mm). They feature a maximum thickness of sheet metal or other material to be drilled or reamed of up to 4 mm. They will prove useful in the professions of sheet metal workers, mechanics and locksmiths.