Size :M3 0.5 M4 0.7 M5 0.8 M6 1.0 M8 1.25 M8 1.0 M1 0.25 M1.2 0.25 M1.4 0.3 M1.5 0.35 M1.6 0.35 M1.7 0.35 M1.8 0.35 M2 0.4 M2.5 0.45. This is a small straight groove tap, which can be used for tapping of round through holes or shallow blind holes.
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