The Manfrotto E200 Spigot fits has a Junior  1-1/8″ (28mm) base and a standard 5/8″ (16mm) top for receiving flash heads and smaller continuous lights such as Redheads and Blondies, LED’s etc.

Specifications:

Base diameter: Junior 28mm (1*1/8″)

End diameter: 16mm (5/8″)