The Rosco LitePad Swivel Arm is an 8.75" ball and socket arm with a 5.5 lb weight capacity that will support all Litepads except the 24 x 24" model. The construction retains much of the movement of the Snake Arm but with a higher maximum load and increased mounting options. One end has a 5/8" (baby) male stud with a 1/4"-20 female thread. The other has a 5/8" (baby) receiver.