Ideal for securing doors and boxes with narrow mounting surfaces, such as shed doors, storage bins, and tool boxes, this National Hardware 3-1/2" extra heavy gate hinge is specially designed for 2x4 or 4x4 posts. Appropriate for full or half surface attachment, this gate hinge is protected by WeatherGuard technology to resist corrosion. Safe Working Load (SWL): 48 lb | HILLMAN 287BC Extra Heavy Gate Hinges | Size 3-1/2"