Set of powerful metal drills with high-quality titanium nitride coating for particularly long service life and fast drilling progress. Drill diameter increases in 0.5 mm steps from 1-10 mm. Up to 40% faster drilling progress than comparable drills without titanium nitride coating. Up to 6 times longer service life with proper cooling. Metal drills with titanium nitride coating. Metal drills with titanium nitride coating are distinguished by their long service life and high durability. For fast, clean drilling in a wide variety of metals, Plexiglas and hard plastics (do not use for aluminium). Low risk of breakage thanks to high elasticity. Resistant metal cassette for clear storage and protection of the drill bits.