This used 9.5"-long Bottom Bracket from Wooden Camera makes up the bottom portion of the Director’s Monitor Cage v3, which supports mounting up to 9" monitors.
Each end features 15mm rod ports for the cage’s separately available vertical rods, it has a Baby pin receiver with a thumbscrew for mounting on a C-stand, and it features multiple 1/4"-20 and 3/8"-16 threads for mounting additional components. There are passive holes so the Odyssey 7Q monitor can be mounted directly onto the cage.