Spiral point tap with plug type and general-purpose style is made of high speed steel material, steam oxide finish, number of flutes 3, size 7/16'', pitch 14, thread NC/UNC, pitch diameter limits H3, standard projection, shank diameter 0. 323'', general machining taps, tolerance 3B, ANSI standards 105. Heavy-duty HSS spiral point taps for use for through holes general machining applications. GTD taps are for use with steel and stainless steel.