Milwaukee SHOCKWAVE™ Impact Duty™ 3/8" Drive 21-mm 6 Point Socket delivers exceptional impact durability designed for high torque applications. Crafted from high-strength forged steel, this socket features long-lasting stamped size markings for quick and easy identification. Its non-slip hex geometry helps prevent fastener rounding, ensuring a secure grip every time. The socket’s dual-hole design and ring groove provide added convenience for easy attachment and removal. Optimized for use with 3/8-inch drive impact wrenches, drivers, ratchets, and adapters, this socket is built to perform reliably in demanding work environments. Model Number: 49-66-6144