BOGEN SWIVEL UMBRELLA ADAPTER (LITE TITE) / Cat. No: 026 (Formerly #2905) Allows you to swivel your lamp head and also attach an umbrella. Accepts umbrella shafts up to .47″ diameter (12mm). BUT!!! In the motion picture industry this cuter little bugger acts as a transformer for grip equipment. The basic unit has two 5/8″ (standard USA Grip Gear Diameter) sockets, then it has two insert pieces: One 1/4 -20 male to 1/4-20 female, and the other adapter is 3/8-16 male to 3/8-16 female. The possibilities are definitely not endless, but it is a good problem solving piece of equipment when it comes to marrying odd sexed items together. A must have item for every rigging grip.