Top Mount Hanger. Installation is fast and easy. Top flange simplifies placement and the side flanges laterally support the I-joist top flange eliminating the need for web stiffeners. Face flange triangle hole (optional) secures hanger against header and can be used to provide increased uplift capacity. Secure the carried I-joist with only one screw in the bottom flange through the seat of the hanger. Material: 18 gauge. Finish: galvanized. Use with 2-1/2" x 11-7/8" wood I-joists. Engineered wood connector