Only needed to drill and tap one hole in mild steel. Opened up hole in stages to 11/16", then used the 23/32" drill to prep for the tap. Then tapped the 1/2" NPT threads to gage. Went in steps, no more than 1/8" depth at a time, then pulled out, cleaned tap and hole of ANY shavings, lubed tap flutes all really good then back in. Don't forget to always cut for 1/4 turn then back out a full turn or so, a couple of times during each cutting portion. Threads are perfect. Drill and tap are both still perfect. Used Tap Magic for both drilling and tapping! ALWAYS!!!
Rating:
[4 of 5 Stars!]