1.00UNM Plug "No-Go" Gage pitch .25mm; UNM stands for “United National Miniature” the American Metric miniature Thread standard. This gage is one piece handle containing No-Go Precision Thread Gage made of High Speed Steel then hardened. Class of fit 1.00UNM is similar to metric M1.0 6H thread. 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.