Knuckledusters are devices that protect the knuckles and increase the effect of a punch or a blow. You aren't allowed to bring knuckledusters into Australia.
This includes items like knuckleduster purses and handbags and knuckduster phone cases.
Lose your goods, on the spot fine, prosecution and large financial penalties may apply
Knuckle duster, knuckleduster, knuckleduster purses, knuckleduster handbags, martial arts knuckleduster
Import permits are generally only issued for police/government use or 'specified purposes' such as for filming a movie.