The Manfrotto 158 Adapter converts a 5/8″ (16mm) light stand top to a 5/8″ female socket. Use it to connect two units with 16 mm spigots, or to obtain a 16 mm female attachment from 16 mm spigot. It is aluminum, 2.56″ (6.5cm) long.
This item repalces old catalog #3101.