The Chicago USA Ratchet Extensions and Sockets Set is a durable and practical tool set designed for automotive use. This set includes 21 pieces featuring a 3/8 inch size, with a chrome surface finish for a sleek look. The SAE system of measurement ensures compatibility with various vehicles, while the lifetime warranty provides peace of mind for long-lasting use. The set includes both extensions and sockets, making it versatile for a range of mechanical tasks. This high-quality tool set from Chicago USA is a valuable addition to any automotive toolbox.