US Style Brass Knuckles/Knuckle Dusters

This is probably the most common design of Knuckle Duster/Brass Knuckles you will find they are American made and probably the most uncomfortable design around. They have round holes and are too far spread apart for the fingers. You can get these in Brass or Aluminium as show here and are sold as "paperweights" The finish on them isn't the best but they are mass produced and sold fairly cheap so they've pretty much come straight out of the mould and into the shops. A bit of sanding and polishing though and they would come up nice.
You can also buy this design made of steel and plated usually in gold or chrome and they are sold as belt buckles and have a removable screw in them so you can use as a belt buckle.