1/2-inch drive, 30-inch (750mm) length, made of high-quality Cr-V steel, professionally heat-treated for high strength and toughness. Surface black phosphate coating resists rust and corrosion, suitable for high-torque operations. Product features: - High-quality Cr-V steel, heat-treated for durability and resistance to high torque - Black phosphate coating, effective rust and corrosion prevention - Built-in spring-loaded ball, stable connection, easy to load and unload - Extends operating range, suitable for narrow and deep-hole operations - Widely used for auto repair and industrial maintenance, ideal for professionals and DIY users Product specifications: - Material: Cr-V steel - Drive type: 1/2-inch - Length: 30 inches (750mm) - Surface treatment: Black phosphate coating - Application: Auto repair, industrial maintenance Notes: - Manual measurement, slight size error is normal - Color difference may occur due to screen display