You must choose which type of starter threads is best for your needs. Seven thread taper is for cutting new threads in soft metals, cased iron, or plastic. Use lots of oil. The shorter-length starter tap is best for cleaning existing threads. The super short starter thread tap is for finishing bottoming threads. I showed this tap to my friend that makes taps for a living and he said it looked ok but his stuff was much better and made of M2 tool steel. Then I told him the price and he said no, he couldn't do that for that price. Couldn't even buy the blank steel needed at that price.
Rating:
[4 of 5 Stars!]