Both sides have a 16mm attachment. Used to connect two units with 16mm spigot, or to obtain a 16 mm female attachment from 16mm spigot.
Based in Northern Italy at Cassola, Manfrotto designs, manufactures and markets a wide range of camera and lighting support equipment for the professional photographic, film, theatre, live entertainment and video markets. The product line includes an extensive range of camera tripods and heads, lighting stands and accessories.