1. collar for creating a lifeline, for placement on the pillars of the construction site in order to dispense a collective protection, characterized in that is configured by two pieces materialized from two equal rectangular profiles (1,1 '') of greater length than the width of the pillar, arranged in parallel, with a gap between them (3) integral with the section of a threaded bar (4, 4 ''), constituting each piece by connecting these elements by their ends by a plate (2, 2 '').
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