Hinge Kits, Fits Square Base Size 26 in, Compatible Grainger Part Number 2RB66, 3ATT8, 3ATT9, 56JN76, 56JN77, 56JN78, 56JN79, 56JN80, 56JN81, 56JN82, 56JN83, 56JN84, 56JN85, 56JN91, 56JN92, 56MW61, 56MW62, 56MW64, 56MW65, 56MW66, 56MW67, 56MW68, 56MW72, 60KT20, Material Galvanized Steel, Includes Curb Cap Channels (2), Curb Mount Channels (2), Hardware Kit, Reinforcement bracket, For Fan Type Downblast Fans, Upblast Fans, For Fan Mounting Type Roof Mount, Container Capacity Not Applicable