The product is a 1-1/4 inch to 11 BSPP 50 MOD pipe thread plug gauge go and no-go, featuring precision measurements of 1.5918 and 1.5989 inches. Manufactured by Regal, this inspection gage is essential for metalworking inspection and measurement, specifically in the CNC, metalworking, and manufacturing industries. It is a reliable tool for ensuring accurate thread sizes and precision in industrial applications.