Safe and simple to use with only one hand! BACK-UP is the revolutionary KONG fall arrester that follow the operator in both directions and stop the possible falling. Shifting the special button on the lock mode,it can be used also as a positioning device or a normal locking device. Due to its special manufacture,BACK-UP supports also the strongest stress in semi dynamic way avoiding the shocking effects on the ropes caused by the traditional self-locking devices with toothed cams. Connector included.