This 12-piece screw extractor set from Bosch is crafted from heat-treated high-carbon steel, ensuring exceptional durability for long-lasting performance. Designed to tackle stripped screws, bolts, and other fasteners, these spiral flute extractors feature rolled threads that provide more accuracy and cleaner operation compared to traditional machined threads. Each extractor is precision machined with left-hand flutes that grip the metal firmly, allowing for effective removal without damaging the work surface. Additionally, laser-etched markings on each piece facilitate quick size identification, ensuring you can efficiently choose the right tool for the job every time. The rust- and tarnish-resistant design enhances the longevity of the set, making it an indispensable addition to any toolbox.