Related Clues:
- Letter-shaped structural support
- I-beam, e.g.
- Horizontal supporting beam
- Large metal beam used in building
- Could the ruddy drilling installation turn up for strength?
- Steel beam named for the letter it resembles
- Flanged structural element
- Support girder
- Main support turning back revolutionary machine
- Big girder
- Skyscraper beam
- Skyscraper component
- Certain metal beam
- Letter-shaped construction component
- Structural steel unit