The strap reel is a retractable type fall arrester with a strap reserve on a drum protected by an aluminium / synthetic material casing. The strap is held taught by a spring and it extends or retracts as the retained person moves around. In case of fall, it locks automatically. Energy absorption is handled by the mechanism itself. Part of the fall prevention system components. Warning: the anchor point must be located at least 80 cm above the working threshold.