USP Structural Connectors RT16, Hurricane Seismic Anchor, 18 Gauge Galvanized Steel, Add Increased Resistance To Wind Uplift & Help Eliminate Toe Nailing, A Fast, Economical Tie To Secure Rafters & Trusses To Wall Studs & Top Plates, Install Using Eight 8d x 1-1/2" & Eight 8d Nails, Reference #H10.