The 21mm ChannelLock Semi Deep Socket is a high-quality, chrome-finished tool designed for automotive and industrial maintenance. With a size of 21mm and a single-piece design, this socket is perfect for getting a secure grip on nuts and bolts. The Metric system of measurement ensures compatibility with a wide range of applications, while the Channellock brand guarantees durability and reliability. Whether you’re a professional mechanic or a DIY enthusiast, this semi deep socket is a valuable addition to your toolkit.