Single D-ring, Permanent Roof Anchor with Stainless Steel Body; Fastens Under Shingles, Leaving D-ring Exposed for Attachment; 19" Including D-ring with 17" Nailing Surface. Features: Designed for under-tile roof ridge or field installationFeatures 17" stainless steel nailing plate with 2" connecting D-ring.Includes 16D stainless steel nails for installation to wood roof structuresMeets OSHA 1926.502 regulations Please read and understand the manufacturer instructions before using this...