What are these clamps called

[cheb]

I've tried various searches but nothing similar looking comes up. They are about 15mm diameter, probably 5/8". I'll be selling them but don't want to misprice them.

 

[Seadog]

A figure screw. In German, Figurenschrauben.

Update: A Carver's screw.

 

[cheb]

Thanks. I tried carver, screw, dog, clamp etc in carious but nothing come on my favourite well known auction site. It suggested I needed Figurenschrauben for a Transit van based my search history.

 

[500e]

Try woodcarvers screw

 

[dan treg]

Try woodcarvers screw

exactly as stated ebay item 135063299208 as an example look at item as a sold listing not current would post a link but forgot how you do it

 

[Seadog]

Or just try 'carver's screw'

 

[dan treg]

i just used google lens first result was carvers screw

 

[Seadog]

i just used google lens first result was carvers screw

Interesting. When tried Lens it tried to interpret the image as a far eastern alphabetic character

 

[Agroshield]

Is there any relationship between the square hole in the wings of the nut and the square on the end of the threaded shaft?

Could it be used to insert or withdraw the tapered thread from whatever it is impaled?

 

[dan treg]

good observation that would be logical maybe cheb could check

 

[cheb]

Is there any relationship between the square hole in the wings of the nut and the square on the end of the threaded shaft?

Could it be used to insert or withdraw the tapered thread from whatever it is impaled?

There is, you can screw the clamp into the workpiece with the wingnut.