very good Materialqualitä a reasonable price

Up where the bracket on the glass put directly (I have only a pane of glass, as in the picture) is oversized transparent plastic sheath, it does not look on the product image. The rings on the arms can be moved.
The bracket is top as wide, so that fits over old, conventional shower cabins with all-round aluminum profile of approximately 16-25mm.
But is not really disturbing, you just need the rubber rings may move slightly. For me it also fit so about my 8mm disc.