Milwaukee SHOCKWAVE™ Impact Duty™ 1/2" Drive 21-mm 6 Point Socket delivers exceptional impact durability for demanding high torque applications. Crafted from high-strength forged steel, this socket features a non-slip hex geometry designed to prevent fastener rounding, ensuring a secure grip every time. Its dual-hole design combined with a ring groove allows for easier socket attachment and removal, enhancing user convenience. Optimized for use with 1/2-inch drive impact wrenches, drivers, ratchets, and adapters, this socket also includes long-lasting stamped size markings for quick and effortless identification, making it a reliable addition to any toolkit. Model Number: 49-66-6253