Frontline Bull Ring Reusable Roof Anchor* Anchor fits most flat roof wooden structures. * Anchor is made up of ASTM rated steel, making it high strength and reliable. It is also Zinc plated steel for better corrosion protection. * Bull ring anchor is small and compact, and can be set up in minutes. * The anchor conveniently comes with it's screws, so its ready to install straight out of the bag. * Anchor can be conveniently reused, screws need to be replaced and installed in new substrate