3M Protecta Rebel Self Retracting Lifeline, 20 ft, Polyester Web, 3100431 SWIVELING ANCHORAGE LOOP AND CARABINER: Limits lifeline twisting for smoother operation and added worker satisfaction, and the included carabiner provides a means to attach the SRL to an anchorage device. SELF-LOCKING SNAP HOOK ON LIFELINE: Automatically locks and closes for added safety, and its rugged construction is built to last. COMPACT, LIGHTWEIGHT DESIGN: Small size and shape make this device easy to use, relocate, store and can be easily used as a lanyard replacement. COMPACT AND LIGHTWEIGHT: Makes installing into concrete simple, fast and easy for added worker satisfaction and productivity. QUICK ACTIVATING SPPED SENSING BRAKE SYSTEM: Stops a falling worker within inches, providing more protection at low heights. HIGH CAPACITY EXTERNAL ENGERY ABSORBER AND IMPACT INDICATOR: Specialized built-in external absorption system maintains safe fall arrest forces for users and tools up to 310 lbs. (141 kg) and provides a visual alert that the SRL has been involved in a fall