arranged so as to face away from the hands of a prisoner who is shackled by the cuff arrangement it will be impossible for the prisoner even if he is provided with a key to be able to manipulate the locks of the respective cuffs this is due to the rigid arrangement of the cuffs in their respective planes p1 and p2 in addition there is another advantage which inures to the benefit of the multiple cuff arrangement of the invention in that if the cuffs 10 and 12 are arranged on a single limb i e the wrist of a prisoner the one cuff will conceal the keyhole of the other cuff more specifically in the illustrated arrangement the cuff 10 if pivoted to overlapping and substantially coincident relationship to the cuff 12 would conceal the keyhole 66 thus making an unlocking of the cuff 12 impossible without the prior opening of the cuff 10 from what has been stated above it will be seen that each of the cuffs includes a base cuff element including two rims and a serrated element pivotally connected between these limbs by the related pivot pin such that the elements are adapted to cooperatively form a closed loop the closed loop is formed relative to cuff 10 by a movement of serrated element 18 in the direction of arrow 70 which represents a counter clockwise polar movement relative to pin 50 as illustrated in fig1 on the other hand serrated element 22 of cuff 12 will have to move for purposes of closing in the direction of.