The Miller RA41, single D, permanent Roof Anchor is designed to provide fall protection on rooftops. The anchor can be applied during new construction or retrofitted into the design of finished roofs with asphalt shingles, shakes or tiles. The Single D is nailed securely across the ridge opening and the roof is finished, overtop of the Single D, with the roofing materials and ridge vent. Only the D-rings are left exposed for a quick and safe connection.