Frontline Stainless Steel Double D-Ring Permanent Roof Anchor* Installs onto wooden or metal structural roof members. * Can be conveniently installed on the pitch or flat surface of the roof * Includes two d rings, tie off depending on the work direction one user at a time * Made up of highly durable stainless steel material, which helps with corrosion resistance. * Lightweight and easy to install. * Includes nails and ready to use straight out of the bag. ** Meets or exceeds all applicable OSHA Standard for