The product is a 7/16-20 NF-2 Thread Plug Gage, specifically designed for measuring the size and accuracy of threads. This tool falls under the category of inspection gages and is essential for ensuring high-quality CNC, metalworking, and manufacturing processes. With a go gauge for measuring up to .4050 inches and a no go gauge for up to .4086 inches, this thread plug gage is crucial for precise measurements in various industrial applications.