Guardian Gap Anchor* The Gap Anchor easily adjusts to fit doorways and window openings from 24" to 51." * Made of lightweight aluminum and weighs only 15 pounds, so you can easily take it along to your next job. * The Gap anchors is a single point tie off designed for one worker that utilizes a zinc coated forged D bolt Anchor point, so it is super strong. * Features a secure bracing system for added stability. ** Only a Heavy Duty Edge Retractable is allowed to be used