The 14M/M-1 M/M Thread Plug Gage is a precision tool designed for measuring the accuracy of threads in a grooved cylindrical shaft. Specifically tailored for Cadillac vehicles, this gage allows for controlling the quality of thread sizes to ensure proper performance and compatibility. With a GO measure of .5256 inches and a NOGO measure of .5223 inches, this thread plug gage is a reliable addition to any metalworking inspection and measurement process.