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SRLs come in varying lengths and styles, and contain a mechanism that allows the lifeline to stretch out to its maximum length, and automatically retract when the worker backs up or steps back. Like seat belts, they instantly lock when a sudden force is applied. Because of the retraction and instant locking, SRLs significantly reduce free-fall distance and the consequent stopping forces applied to the body. Historically, SRLs were mounted to the anchorage due to their bulk and weight, with the retractable end attached to the worker’s back D-ring. The newer, lightweight personal fall limiters, designed to replace lanyards, are mounted directly to the back D-ring, with the retractable end attached to the anchor point.