The inside dimension between inner edges of mounting brackets is 49.5", so that is the maximum opening your shower could have to use this.  It is not expandable, and is a nice and sturdy build.  

Not sure what the brand is but it was special ordered, not some cheap item from Wal-Mart or something

I have 2 available - were both used together for inner and outer curtains

It is in nice shape - some light corrosion near top of bracket ends but not really noticeable.

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