Milwaukee 1/2" Drive 18-mm Deep Socket w/FOUR FLAT™ Sides is designed for versatility. It features four parallel flat sides that help prevent rolling and provide wrench-ready capabilities, making it easier to use in various situations. The socket is clearly stamped with its size for quick and easy identification, saving you time on the job. Its optimized geometry is engineered to reduce bolt rounding and stripping, ensuring a reliable grip and longer tool life. Model Number: 45-34-9142