Slang terms

Question

I would like to know the Mex. word for "brass knuckles" in Spanish. There are words I need to explain in Court at times that are not in dictionaries. Thanks

Answer 1

brass= bronce (type of hard, sturdy metal); by analogy iron = hierro, steel= acero.
Knuckles= nudillos (joints of fingers bones)
Spanish term may be = Puño de acero, puño de hierro.

Answer 2

Manopla (de acero), I think.