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This 19 Piece Drill bit Set for Metal comes in sizes ranging from 1mm up to 10 mm in sturdy metal case. For exceptional demands and precision work in handcraft and industry. Precision spiral drill bit made of cobalt-alloyed high-grade high-speed steel according to DIN 338, precision-ground, cylindrical, type N, reinforced core thickness, with crosswise grinding 135° according to DIN 1412 C (from 2 mm), diameter tolerance h8.