Manfrotto 158 both sides have a 16 mm attachment. The Manfrotto 158 is used to connect two units with 16 mm spigot, or to obtain a 16 mm female attachment from 16 mm spigot.
Manfrotto 158 features:
• It converts 5/8'' (16 mm) stud to a 5/8'' socket
• Multiple usage
• Easy to mount
• 6,5cm in height