These Professional thumb cuffs work just as good as hand cuffs. Just put these on a friend and watch them try to get out. These thumb cuffs are lightweight and compact, they feature a double lock to open just one side or both at the same time. These thumb cuffs were designed for official police use. These thumb cuffs are extremely effective at disabling and restrict the mobility of unpredictable criminals. Each thumb cuff features deep ridges to hold the thumbs tight and secure, the ridges also discourage the person from fighting the restraints do to intolerable discomfort when the suspect struggles and fights the restraints. These Thumb cuffs will not slip off. They are made of 100% hardened steel and DO NOT have a safety latch so the suspect has no way of getting out of the restraints other then by key.