While searching for a set of taps and dies to recommend to professional tradesman I ran across the TEKTON 45 Pc SAE or Metric Tap and Die Set.
The taps and dies in this set are all made from heat treated tungsten alloy High Speed Steel (HSS). Unlike many sets that are made from high carbon steel, this set can withstand the high usage conditions frequently found in machine shops, high volume auto repair and mechanical shops, and industrial HVAC companies.
The TEKTON 45 Pc SAE or Metric Tap and Die Set comes with all the accessories you need to tap or chase proper fitting Class 2 threads.
You can order this set in either the SAE Model 7560 or the Metric Model 7561 which makes economic sense if you only need one series.
As a tool & die maker and small machine shop operator (semi retired) I highly recommend the TEKTON 45 Pc SAE or Metric Tap and Die Set .