Thumbcuffs are a metal device that locks the thumbs close together. This restraining device was originally used by detectives, narcotics officers, and other law officials who were attracted to their easy portability and ability to conceal. However, their use is now widespread among the BDSM community.
The wearer must extend their thumbs completely to apply the thumbcuffs. They are worn below the knuckles which prevent them from slipping off. They can be removed using the key provided.
Most thumbcuffs have a rigid design, but those used in some Asian countries appear like miniature handcuffs and have small chains linking each cuff.