|>>|| No. 19908
You're all largely wrong, but
has it closest to right with:
> A proper knuckle duster -the type with a second bar which rests against your palm ....
A proper knuckle duster acts like a boxer wrapping and taping his hands, only with added metal.
Many people incorrectly think that wraps (and indeed gloves) are there to provide extra cushioning for your knuckles and thereby protect the other boxer. However in reality the hands are made up of many small joints and bones that could easily fracture from the impact of a decent punch to any solid bone/muscle surface (skull, forehead, forearms, even the shoulder muscle (deltoid)) and that is why boxers wrap and tape their hands; to secure all the loose joints and movable bones in the hand together, turning a glass sword into a veritable mace.
The primary action of a proper knuckle duster, the type with a second bar which rests against your palm, is to deflect the impact force away from the highly vulnerable metacarpus and into the sturdier ulna/radius.
As long as the knuckle duster is of sturdy enough construction so as not to shatter upon impact its composition is entirely secondary, and largely irrelevant to the damage inflicted by a given blow.