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Precision drilling for demanding projects. The Rosenthal Burs Twist Drill 1.40mm, ISO #014 Busch®, is engineered from premium tungsten carbide, ensuring exceptional durability and consistent performance. This drill bit is designed for precision drilling in a wide range of materials, including metals, plastics, wood, and resins. Ideal for intricate jewelry making, detailed crafting, and demanding applications where accuracy and longevity are crucial.