T-115 is a stamped steel slat clamp. This particular slat clamp would be used to secure the end of a wooden slat to a trunk.
Overall measurements are 2 1/4" wide by 3" long.
These clamps are raw steel and may rust over time if not coated. A clear spray lacquer works well but they need to be cleaned with soap and water to remove a light protective coating of oil prior to coating them. They can also be painted after a thorough cleaning and light sanding.