Shawn is correct. This is a homemade tool. It is not a "part". Someone welded up circles to a carriage bolt so they could stamp a row of circles in leather or copper sheet by hammering the bolt head with a mallet. There won't be a link to the exact item because it is homemade one of a kind. The links below show some commercially available tools and what they make.

Sorry those are homemade tools. Likely for leather or repousse work. The shank is made from carriage bolts and the welds are terrible looking. If the were production tools they would be refined a bit more for ascetic purposes.

References:

https://shop.hamiltonmarine.com/products/carriage-bolt-bronze--25x6-50-w-o-nu...

Reason:
Could you at least let me know what this part is and what it is for?

Shawn is correct. This is a homemade tool. It is not a "part". Someone welded up circles to a carriage bolt so they could stamp a row of circles in leather or copper sheet by hammering the bolt head with a mallet. There won't be a link to the exact item because it is homemade one of a kind. The links below show some commercially available tools and what they make.

References:

https://proleathercarvers.com/collections/background-stamps/products/ska101-7...

https://www.google.com/search?q=stamping+leather&source=lnms&tbm=isch&sa=X&ve...