Traditional solid cast non-adjustable cuff with a spring barrel lock. Still in use in Britain (and around the world) as it has been for over a hundred years. Quick to put on, but slow to take off. Another configuration, pair of 104 cuffs welded to rings on either side of a sturdy waist chain - which can be locked on with a padlock. A practical restraint for prisoner transportation - a close relation of the Gang Chain. Polished metal only.