The Guardian Fall Protection Bull Ring Anchors are suitable for personal fall arrest, restraint, or work positioning applications. For all applications, the worker weight capacity range (including all clothing, tools, and equipment) is 130 to 310 pounds. The anchor itself is constructed of 100% zinc-plated steel. Substrate must be roof truss or support beam that is minimum of 3" thick CDX or better. All fasteners (use either six 16d, 3" long 8 gauge nails or three 1/4" x 3" zinc-plated steel...