Authentic hospital restraints, also called psychiatry restraints. These solid leather straps (wrist cuffs, ankle cuffs, head harness) are used to secure your "BDSM patients".
These ankle restraints use a belt buckle locking system, but you can add more security by placing a padlock through the buckle. Now you can be sure that your partner won't be able to remove them without the key. There's a D-ring so you can attach the cuffs to each other (using a quicklink) or to other bondage gear.