SmallRig Lens Mount Adapter Support for BMPCC 4K 2247 is designed to work with SmallRig BMPCC Cage 2203, CVB2254 and CVB2255. It mounts to the cage by two M4 screws, and lock the Lens adapter by one 1/4 screw. It supports the Lens adapter, relieves pressure from heavy lenses and prevents loss of signal.