Ключевые слова: background, bit, bits, burr, butt, caliber, calibre, conic, conical, cutter, design, device, diameter, drill, enlarge, fast, focus, hard, hexagon, hole, hss, instrument, isolated, kit, material, metal, mill, milling, set, shank, sharp, special, stairstep, steel, step, tip, tool, unibit, unibits, white, work,