Milwaukee 3/8" Drive 5/8" Standard Socket w/FOUR FLAT™ Sides is designed for versatility. It features four parallel flat sides that help prevent rolling and provide wrench-ready capabilities for added convenience. The socket is clearly stamped with its size, making it quick and easy to identify. This deep socket also boasts optimized geometry that reduces bolt rounding and stripping, ensuring reliable performance during use. Model Number: 45-34-9066