Guardian's Parapet Anchor is for use as a single point tie-off, placement of guardrail uprights, or with a horizontal rope lifeline. This anchor also includes a safety pin for a secure adjustment and fit with walls from 4" to 20" in width. The 15171 Parapet Anchor is reinforced to last longer and features easy-to-grip adjustment handles for a quick set-up. This anchor for guardrails can be used with lanyards and retractables, but is only for use as a single point tie-off when not being used as part of a guardrail system. Guardrail posts not included.