00-90 UNS-2B Plug Gage UNS stands for (American) "United National Standard" miniature Thread series. This gage is one piece handle containing Go Gage member Precision Thread Gage made of High Speed Steel then hardened. Standard fit is 2B tighter 3B gages are made to order. Picture is representative of part, Brand is;" MiniTaps" made specifically for us in Switzerland. The purchase of this item Includes: the thread Gage, Handle with serial number engraved, and Certificate tied to the serial number with factory measurements and the thread standards.