Guardian Bull Ring Anchor* The Guardian Bull Ring Anchor is easily installed with either six 16d, 3" long 8 gauge nails or three 1 4" x 3" zinc plated steel hex head lag screws. * The substrate for this anchor installation must be a minimum of 12 CDX plywood or better and 2 12 of a roof truss or support beam for a minimum total thickness of 3". * The Bull Ring Anchor is completely reusable and can be used from job to job, just make sure you use new fasteners each time. Just