Miller Stainless Steel Permanent Double D-Ring Roof Anchor, 310 lb. Capacity (RA40) ROOF SAFETY: Provides 2 safe anchor points when securely installed on wood roof peak (sub-surface) or vertical wall; only the permanent D-ring anchors are exposed for added roof safety while working STRONG & DURABLE: The anchor body is made of strong stainless steel, and the D-ring anchors are zinc-plated steel to resist corrosion for long service life; package includes eight 16d nails NEW & RETROFIT ROOFS: Permanent roof anchors are ideal for new construction or for retrofitting roofs with asphalt, shake or tile roofing materials MULTIPLE APPLICATIONS: Roof anchors can also be used for gutter cleaning, window and skylight cleaning/repair, chimney maintenance and general roof maintenance CERTIFICATION: Meets OSHA 1926.502 guidelines; accommodates single user up to 310 lbs. (140.6 kg) for fall protection