• High-strength 45# steel adapters and reducers, heat-treated and chrome-plated. • Corrosion-resistant, rust-free, high hardness, and durability. • Firm grip thanks to a metal ball. • Developed to meet various demands, it fits chucks or hand screwdrivers. • Commonly used in car and engine repair, suitable for ratchets, nuts, drills, socket wrenches, cordless screwdrivers. • Includes: 6 socket wrench nut pieces, adapters from 1/4'' to 3/8'', 3/8'' to 1/4'', 3/8'' to 1/2'', 1/2'' to 3/8'', 1/4'' to 1/2'', 1/2'' to 1/4''. • 8 square rods of different sizes. • Chrome vanadium steel material, smooth edges, high-temperature resistance. • Chrome body with anti-slip ball spring. • Wide range of applications in car repair, DIY, home maintenance.