SwissTech: M4X0.7 Blue Sp/Ft 371 HSS-EV OX Tap Spiral Flute (BLF) - 'Biteless Flat' ISO Metric Coarse HSS-EV Oxidised Finish. For shorter blind holes. Taper lead to DIN form C (3 x P). Tapping tolerance to 6H. Manufactured to DIN 371/376. '…View more