Joist Hanger. The joist hanger is designed to connect triple 2x8 dimensional lumber to wood headers. The two "Speed Prongs" are designed to temporarily position the hanger on the header for more convenient nail fastening, but specified nails must be used to achieve listed loads. Material: 18 gauge. Finish: Z-Max (for projects involving Pressure Treated Wood). Installation: use all specified fasteners. Dimensional connector. 4-5/8" W x 6-1/4" H x 2" B