Mobile fall-arrest device for rope. With its unique locking system, the ASAP LOCK is a reference product in fall protection for workers at height. In normal use, the device moves freely along the rope without any manual intervention and accompanies the user in all his movements. In case of shock or sudden acceleration, the ASAP LOCK locks on the rope and stops the user. The ASAP LOCK may also be combined with an ASAP’SORBER energy absorbing lanyard to work at a distance from the rope.