This is a metal parallelogram arrangement for binoculars and appears to be made of aluminum. The swivel action on the parallelogram is nice and smooth. But I have no counterweight and no "L" bracket on which to fasten the binoculars.
Also, this unit will definitely need a bit of work - I believe the threads are stripped in the brace for the bolt that sits behind black 5-star knob in the photo. The result is that the altitude adjustment for the binoculars cannot be tightened. I'm guessing that for someone relatively handy, this should not be too difficult to fix.