The NEW- 7/8 16 UN 2B THREAD PLUG GAGE by NORTHEN TOOL is a thread gauge designed for metalworking inspection and measurement. Made in the United States, this unit includes one gauge with measurements for both .8344 and .8407. It is a precise tool used in CNC, metalworking, and manufacturing businesses to ensure high-quality thread accuracy and consistency. The go and no-go plug gage allows for efficient inspection of threads to ensure they meet the required specifications.