Review on Grinder Adjustable Spanner Lock Nut Grinders by John Vann

I have three grinders from three different manufacturers and they all have different keys. It is very convenient to have one button that can be configured for everyone. I don't know how durable it is yet, but I have a tool that seems to be stuck and it will take a little effort to unscrew the lock nut. I think I'll have to edit this review once it's done.