The G L Huyett Key M4 x 4 x 16 Form B is a precision-engineered component made from high-quality carbon steel, designed for reliable performance in various mechanical applications. With dimensions of 4 mm in width and 16 mm in length, this key is ideal for securing rotating parts in machinery. It meets industry standards for form and fit, ensuring compatibility with a range of systems. The key's surface is finished to provide durability and resistance to wear, making it suitable for both light and heavy-duty applications.