Explaining Everything on Instagram: "Handcuffs are mechanical restraints used to limit a person’s wrist movement by locking both wrists close together. Each cuff has a ratchet mechanism with small teeth that allow it to tighten in one direction but not loosen without a key. When the cuff is closed around the wrist, the teeth engage with a spring-loaded pawl that locks it securely. A double-lock feature can also be activated to prevent the cuff from tightening further, ensuring safety and comfort