SELF EVACUATION OR RESCUE OF ANOTHER BY CONTROLLED DESCENT TowerPack II™ is designed to meet the requirements of mast and tower climbers who need to evacuate themselves or recover an injured worker. Allowing for immediate descent of a rope, the kit includes the PowerLock™ descender. The PowerLock™ descender has a double action safety mechanism which will brake if the user either lets go or squeezes too hard in panic. Prior to descent, the PowerLock™ easily adjusts the amount of rope slack and provides excellent braking control, even with a load of two persons. This system does not include a rescuer harness. This Solution is tested as a unit to comply with ANSI Z359.4.