Review on AI Vise Piece Size 4 8Mm by John Destruction

I don't know what you can use them for. My experience and intended use of a pin vise is to hold an object [like a drill bit or other small round material precisely centered] centered and somewhat secure. It's not like this. they are completely useless. At first glance they seem like a good tool, but try centering a small drill bit in a three-jaw collet that won't close in the middle - good luck.