These bicycle chain handcuffs are supposed to be a French design but I have not had time to research them properly. They are a bit fiddly but the chain more easily takes the shape of the prisoners wrists because of the multiple linkages. The internal circumference is 7 inches or 8 cms or 7 1/2 (9 cms) if you make the overlap less. They weigh around 450 cms and are nickel plated steel
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