Hi. New member here. I've recently found this clamp and was wondering what it could be used for.
Made by Griffin, made in England. On the back it says pat regst 36 09 62.
I think its to hold pipes, but at 90deg t each other.

the main body is cast, and is non magnetic (ali/mag?)
the screw is not magnetic, but the cross handle is irn/steel

screw size od =7.93mm, which suggests 5/16 whit