S Grip Spigot Glass Railing System can be used in both the exterior and interior. Most commonly this system is excellent for interior application in Staircase & Cutouts, where the entire perimeter is exposed to a more modern look. Fascia Spigots are installed in solid surfaces such as Steel, Wood or Concrete, in the face of Staircase or Balcony. The glass is suspended vertically by Spigot, and each piece is independent of the other piece for support, unless a handrail is installed for additional strength.