Thumbcuffs

Thumbcuffs are a metal restraining device that lock thumbs in proximity to each other.

Thumbcuffs were originally intended for use by detectives, narcotics officers and off-duty policemen, their size allowing them to be carried in the pocket.

Most are rigid devices, while some used in Asian countries are chain-linked, like miniature handcuffs.

Thumbcuffs are rarely used due to an increased possibility of injury, most commonly by tight cuffs blocking blood circulation.

[4] Thumbcuffs may also be used as improvised toecuffs by locking the big toes in proximity to each other.