I processed it with a 3.3 mm pilot hole and opened this throw with a throwing electric dollar but it was tapped cleanly without problems. I do not yet understand the durability, but I think whether it is good.
I have used various stainless steel for TAP processing, but it has stopped running immediately. Most of this TAP does not go away. I do not think that all the sizes are right now, so I want Long TAP and all sizes.