This hex wrench, with a diameter of 1.27 mm and dimensions of 4.45 cm by 1.52 cm, is designed for precision work with small hex screws, like the #4-40 set screws found in some mounting hubs. Its black oxide finish offers robust protection against rust.Perfect for hobbyists and professionals alike, this tool is invaluable for assembling and disassembling components that require a precise fit. The compact size makes it easy to use in tight spaces, ensuring that even the most intricate tasks are manageable.One of the standout features of this hex wrench is its durability. The black oxide finish not only enhances its appearance but also significantly extends its lifespan by preventing corrosion. This means you can rely on it for consistent performance over time, making it a smart investment for any toolkit.