National Hardware 10" x 1-1/2" Black Heavy Duty Mending Plate is designed to provide strong reinforcement, attachment, connection, alignment, and splicing for various materials. This heavy-duty mending plate features a durable black powder coat finish that enhances its resistance to weather, making it suitable for both indoor and outdoor applications. It includes slots designed for 5/16 inch carriage bolts, allowing for secure fastening. Please note that the safe working load depends on the specific application and fasteners used, so consulting with design professionals is to ensure this product meets your project requirements. Model Number: N351-456