These high Security Irish Eight style handcuffs are a rather good combination of old and new.  They combine the uncompromising rigid design of the Victorian Irish Eight with the incorporation of a modern Yale type tumber lock which snaps shut very easily.

These wonderful handcuffs in medium measure 7 1/2 inches (19 cms) in internal circumference.  To see whether they will fit your prisoner just stretch a piece of string round his/her wrists and measure!