These panels of glass are clamped together either end of the glass to save money on hole cutouts where the glass would normally be clamped to the wall. These metal supports are then drilled into the wall and support your glass panel up.
The following diagram shows how the supports on either side of the glass hold the glass up. This product is designed to save you money on your Juliet Balcony by not needing any cutouts in the glass.
Watch the following video for more details of the unique Skyforce balconies: