Milwaukee 1/4" Drive 5.5-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 for added convenience. The socket is clearly stamped with its size, allowing for quick and easy identification. Its optimized geometry reduces the risk of bolt rounding and stripping, making it a reliable choice for various applications. Model Number: 45-34-9043