The Manfrotto 026 swivel adapter can be mounted onto any standard light stand such as the Manfrotto 004 Master Stand or a c-stand etc and is used to mount light heads (spigot also required) and a variety of other accessories including umbrellas.

Specifications:

Attachments: Bottom: 1/4″-20 and 3/8″-16 female threaded 5/8″ (16 mm) removable stud with 5/8″ (16 mm) receiver
Top: Umbrella, 1/4″-20 and 3/8″-16 male threaded 5/8″ (16 mm) removable stud with 5/8″ (16 mm) receiver

Tilt angle: 180 deg