VOLKEL - M21 x 1mm - Double Ended HexTap. These taps have been manufactured by VÖLKEL, with 100 years of experience in manufacturing taps & dies, VÖLKEL has become one of the worldwide leading suppliers for threading tools.  Application: for general use non abrasive material up to 900 N\/mm² unalloyed and low alloyed steel for through and blind holes for thread cutting by hand Advantages: Pilot for exact alignment Rougher and Finisher combined in one tool Use in awkward places For making new threads For cleaning and repairing damaged threads Hexagon Hole for Ratchet or Hexagon Keys External Hexagon for Open-End Wrench This is not a stock item therefore please allow 1-3 working days for dispatch. As this is not kept as a stock item, this is non-returnable & non-refundable. VOLKEL - M21 x 1mm - Double Ended HexTap