Milwaukee 3/8" Drive 5/16" 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 on the job. The socket is clearly stamped with its size, allowing for quick and easy identification. This deep socket also boasts optimized geometry that reduces the risk of bolt rounding and stripping, ensuring reliable performance and durability. Model Number: 45-34-9061