This is a connector. It's used for hanging from the ceiling. Screen 1 shows the front, Screen 2 the side, Screen 3 the back, and Screen 4 a close-up of the front, making it easy to understand. The size is approximately 5cm in length, 1.6cm in width, and 2cm in height, about 2.5cm including the metal fittings. It's not new, but I think it's perfectly usable. Thank you for looking.