I've been working with metal for almost 50 years and  never had a wire bending block, almost bought one a few times. Here is a new /old one in a bocx. Damn I'm disappointed, it's pot metal! Well didn't spend any money on it.

I also have one and use it once in awhile.  It is also pot metal, it was among my mother's stuff and she used it in craft work.

They are all pot metal, I've had several over the years, tried to bend too heavy of wire, yep they are pot metal.