veritasAequitas
Green Belt
There no such thing in UK law as assault with an offensive weapon,, there is Wounding with a weapon, but that's any weapon, even aCard board tube, which will always have the legally specified defence of SELF defence.
If wearing them is carrying an offensive weapon, ( which is an offence) is debatable, but possibly so
The brackets/necklaces they sell are taught to be used as knuckle dusters/flails.