SwissTech: M3X0.5 Purple Sp/Fl 371 H SS-PM Nit Tap Right Hand Cutting - Left Hand Spiral Flute HSS-PM Nitride Finish. For through holes. Left hand spiral. Taper lead to DIN form D (3.5 x P to 5 x P). Tapping tolerance to 6HX. ISO Metric Coa…View more