The Craftsman 3/8 Drive 21mm Shallow 6-point Impact Socket is a high-quality hand tool designed specifically for automotive use. This single item socket features a durable construction and a 6-point design for added strength when driving nuts and bolts. With a metric system of measurement and a size of 21mm, this socket is ideal for a variety of applications. The Craftsman brand ensures reliability and longevity in this essential tool for any mechanic or DIY enthusiast.