I have a couple of Import sets. And can’t complain about the price and or quality. I also have just simple flat stock for certain jobs/applications. And that works too. The question of a parallels tolerance in my shop far exceeds the scope of my hobby shop parameters. Meaning, everything else is trying hold a thou when the parallel is in the tenths. The parallels usefulness is big in my shop, but its manufactured tolerance is not really in the big picture of things. I did check them out when procured, but have not rechecked since. I do check for raised nicks and clean before using. Hope this helps…Dave