You will not find any forming taps (Jarflo's) that work as well as ours! Jarvis Cutting Tools has the ability to grind either a crest flat or a crest radius. Traditionally, taps are produced with crest flats. This truncated thread form works the best in some applications, but Jarvis ground crest radius has significant advantage in a wide variety of applications. The crest radius provides an edge prep for forming taps. The rounded shoulders can dramatically increase tap life and create much stronger threads. In fact, there are many applications which now specify Jarvis' crest radius because of the extra strength they provide.