Definition - What does Manacles mean?
Manacles are metals rings designed to restrain the ankles or wrists of a submissive in BDSM sex play. They are usually joined by a chain. Some variations are hinged or made from solid steel bars. They are alternatively called cuffs; handcuffs for wrist bondage and ankle cuffs for ankle bondage.
Kinkly explains Manacles
There are innate risks in using manacles for sexual bondage. Tissue and nerve damage can occur. It is important to agree on a safe word. It should be used if a submissive feels unbearable discomfort. Likewise, refrain from using police handcuffs. These are not made for bondage play, and can result in handcuff neuropathy