From the Manufacturer The Guardian Fall Protection "CB-12 Roof Anchor" is the tried and true permanent fall protection anchor! This product is great for use with retractable lifelines, vertical lifelines / rope grab units, or horizontal lifeline systems and can be installed on wood, metal deck or concrete substrates (fasteners are provided for wood and steel applications). The anchor's 12-Inch tall post extends past roofing substrate to keep attachment point high enough that it is sill accessible after the roof is complete. This round post also works well with most off-the-shelf flashing kits.