padlock uses this same standard key.

To prevent the restrained person from eventually opening the handcuffs with a handcuff key, a handcuff cover may be used to conceal the keyholes of the handcuffs.

Hinged and rigid handcuffs

When applied behind the back with keyholes away from the hands, handcuffs connected by a hinge or rigid bar are much more secure than handcuffs connected by a chain. Even with a key in hand it is difficult or impossible to

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