Abstract: A restraining device for use in securing a prisoner having an upper control strap gripped through a releasable cam buckle and secured to a pair of handcuffs worn by an individual behind his back, the loose end acting as a hand grip. The cam buckle is attached to leg shackles worn on the ankles of the prisoner be means of a lower strap loop of fixed length The length of the upper control strap between the handcuffs and the cam buckle can be adjusted by pulling the control strap through the cam buckle, thus tightening the restraining device relative to the prisoner's wrists and ankles. The overall length can be increased by opening the cam buckle and sliding the buckle along the control strap as desired. A strap lock is located on the loose end of the control strap to be slid to a position against the cam buckle to assure a secure closure thereof.