This is a Manfrotto 118 Universal Short Spigot with Double Male Thread. It fits the (2905) Swivel Umbrella Adapter. 5/8" diameter with 1/4-20 and 3/8" threaded tip.

Specification:

• Weight: 35g- 1.23  oz
• Attachment (bottom): 3/8" screw
• Top Attachment: 1/4″ screw, 5/8″ (16mm) stud
• Material: Brass
• Colour: Brass
• Height: 4 cm - 1.57 in
• Superclamp Compatible: Yes