I have found a number of something like an wall anchor of a type I not
seen before, found on a shelf in my workshop, from long ago and a
forgotten purpose.

Unlike a Rawlbolt, they lack a screw thread, they just have a wedge
which probably wedges if hammered into the hole and around 7mm overall
diameter. Instead of a bolt or thread once installed, they just have a
flattened part poking out, which is flattened out to an eye. They are
anodised and gold colour.

I just cannot think what use they might be, but obviously made/ sold
for a specific purpose.

Harry Bloomfield wrote:

Unlike a Rawlbolt, they lack a screw thread, they just have a wedge
which probably wedges if hammered into the hole and around 7mm overall
diameter. Instead of a bolt or thread once installed, they just have a
flattened part poking out, which is flattened out to an eye. They are
anodised and gold colour.

Similar to this?

http://osdgroup.it/eng/product.asp?p=1582

I just cannot think what use they might be, but obviously made/ sold for
a specific purpose.

Apparently for fixing wires and nets to buildings to keep the pigeons off.

on 21/10/2018, Andy Burns supposed :
Apparently for fixing wires and nets to buildings to keep the pigeons off.

Those are they, thanks.