Marble stairs with glass rails in correct dimensions and structure of real stairs.
Marble texture included (4K) . The glass is a simple vray material in 3ds max and glass shader in blender with colour adjustments to be ... glassy . You can tinker it yourself or put another glass material to it. It is UV ready anyway.
The first two renders are from unreal engine as part of a bigger project. The file contains the stairs with the rails only.
If you want another format message me to make the adjustments.