The 1/4-28-UNF-3A Thread Plug Gage is a precision tool used for measuring the diameter of threads in a clockwise direction. This specific gage is designed for Cadillac brand threads, with a go gauge measuring .2268 inches and a no-go gauge measuring .2243 inches. Ideal for metalworking inspection and measurement, this thread plug gage ensures accurate and consistent results in the manufacturing process.