These are garbage. They are dollar tree quality at best, fake "double lock" that is a flip up tab like plastic toys. Anyone looking for real cuffs stick to peerless or s&w. These are not even safe to use as fetish cuffs, they dont always unlock and the locking mechanism is horrible, you will end up in the emergency room explaining how your wrist's got cut. Products like these are gag gifts, not " Professional use". Fast shipping on a garbage product. Very disappointing that i purchased two pairs. I wont even give these to my kids to play cops and robbers with because they are so unsafe.