brass knuckles vs katara

brass knuckles

noun
  • A weapon consisting of a metal reinforcement for the clenched fist, with finger holes molded in. 

katara

noun
  • An Indian push dagger with an H-shaped handle, used predominantly ceremonially, and rarely as a weapon. 

How often have the words brass knuckles and katara occurred in a corpus of books? (source: Google Ngram Viewer )