The HDMI Cable Clamp Attachment for Sony a7S III Full Cage from Tilta attaches to the side of the cage with a single screw and a locking pin to clamp your HDMI cable connector and prevent it from accidental disconnection. This version of the clamp is designed in black to best match the black version cage. After securing the clamp to the cage, you can use the included Allen key to tighten it around the cable connector by tightening the integrated screw at the top of the clamp. The integrated screw is ridged, so you can tighten it with your fingers as well, although not as tight.