Sizes and coverage Size range: 9 mm to 27 mm to accommodate a variety of fasteners and applications. Materials and durability Made of chrome vanadium steel and carbon steel, with rustproof treatment and hardness for longlasting performance. Function and compatibility Efficient nut removal: designed to remove broken, damaged, corroded, stuck, and rusted nuts, screws, screw heads, and bolts for versatile and maintenance tasks. Ease of use and operation Easy to use: features an outer hexagon screw head for straightforward operation with a socket wrench, providing a stable grip for secure clamping and efficient removal. Use scenarios Automotive : remove seized or rusted nuts and bolts in engines and underbody components. Home maintenance: extract stuck or damaged fasteners in furniture, doors, and fixtures. Machinery and equipment service: rusted or corroded fasteners on tools, lawn equipment, and industrial machinery.