Mono jack have internal re-usable anchor wedge which can auto clamp and loosen the wedge,

they are main used for 12.7 and 15.24 type strand ,reinforcement various single tensioning with bonded and unbonded. 

to used in the experiment by root tension pre-tightening ,tension retreat anchor and stay cable tone with single cable.

Mono Jack: (12.7 or 15.24 tool wedge inside)