The Ultra-Lok RSQ SRL with Rescue offers duall-mode operation in one self-retracting lifeline. Workers can choose between fall arrest and rescue/descent options depending on the jobsite environment. In the event of a fall, the Ultra-Lok's rescue/descent mode will arrest the fall and automatically lower the worker to the ground. The product supports a capacity of 310 lbs. and meets applicable industry standards. Capital Safety. 800-328-6146.