The product is a 3/8-24 NF thread plug gage from the brand Perfex. It is designed for metalworking inspection and measurement purposes, specifically for checking the diameter of threads. The gauge has a GO and NOGO P.D. of .3469 and .3536 respectively, making it a precise tool for ensuring the quality of threaded components in industrial settings. This thread plug gage is a reliable tool for professionals in the CNC, metalworking, and manufacturing industries to verify the accuracy of threaded parts. Thanks for looking!