The best replacement for brass knuckles is baton.

The best alternatives to brass knuckles are rated as following:
★★★★★  baton
★★  sap gloves
★★  knuckle dusters

Your alternative for brass knuckles is not listed? Suggest!
Speaking about brass knuckles, one probably shouldn't forget about knife.

Other search terms related to brass knuckles and their ratings are:
★★★★★ knife
★★ switchblade
★ blade
★ knives
You have in mind a companion for brass knuckles and it is not yet here? Propose!



Google Trends

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brass knuckles
baton
sap gloves