From Manufacturer
The ikan STRATUS Complete Cage for Sony a7/a7R III Series Cameras is a full cage that is form-fitted to the third generation of a7 series cameras. The cage section of the STRATUS is based on an Arca-Swiss plate, allowing the cage to be secured to any Arca-Swiss compatible tripod. Surrounding the cage are 1/4"-20 and 3/8"-16 threaded holes, as well as a shoe mount and an ARRI rosette for securing articulating arms, handles, or other essential accessories.
At the top of the cage is a NATO rail for clamping the top handle. The top handle has a shoe mount, and for improved grip can accept a bicycle handle grip. Below the cage, the included rod clamp is height-adjustable, ensuring compatibility with your 15mm rod-based accessories. Two sets of rods, 4 and 8" in length, are included as well, so you can build your rig around shorter or longer lenses. The shorter rods are threaded so they can be used as extensions on the longer rods for even more spread out rigs.