The Genuine BMW Crankshaft TDC Lock Tool (part number 83300495070) is a specialized tool designed to accurately locate the top dead center (TDC) position of the crankshaft in BMW vehicles. This tool is used during engine maintenance and repair procedures, such as replacing the timing chain or adjusting the valve timing. It is made of high-quality materials and is specifically designed for use with BMW engines, ensuring precise and reliable results. The tool is easy to use and helps ensure proper engine timing, which is crucial for optimal engine performance.