The product is a set of 1-7/16 11 1/2 NS thread ring gages by Greenfield, made in the US. These gages include both a "GO" and "NO GO" version, with the specific measurements of 1.4375 and 1.3726 inches respectively. They are designed for metalworking inspection and measurement, specifically used in CNC machining and other metalworking processes. The brand's reputation and country of origin ensure high quality and accuracy in these precision tools for industrial use.