8Sinn Metabones Support Adapter for Sony a7III / a7RIII Cage Key features: – Aluminum made – 2 screws – support-to-cage attachment 1 screw – support-to-Metabones attachment     Attachable directly to the cage by two screws. Every cage has dedicated and matched Metabones Support. The function of this product is to support the Metabones Adapter, which often can be overloaded. This product is not compatible with the: Nikon G to E-mount/NEX (Black Matt) Dimensions: Height: 18mm, Length: 38mm, Width: 19mm; Weight: 11gSet includes: 8Sinn Metabones Support Adapter for Sony a7III / a7RIII Cage