1.20UNM Plug Gage pitch .25mm; UNM stands for “United National Miniature” the American Metric miniature Thread standard. This gage is one piece handle containing Go & No-Go members Precision Thread Gage made of High Speed Steel then hardened. Class of fit 1.20UNM is similar to metric 6H. Picture is representative of part, Brand is;" MiniTaps" made specifically for us in Switzerland.
We have a long form cert available on this gage for an additional charge.