The straight stairs are build on different type of supporting frames:
One single central beam (mod. 200), with two lateral stringers and treads obtain from steel plate to be cut with laser (mod. 500) and lateral framework with supporting handrail on the opposite side (mod. 500 special).
The Treads could be done in massive wood with customized process, in temperated glass , in acrylic, in steel, in marble and every other materials the customer want to have.
For these staircases we can do Steel or Stainless Steel balustrade or glass balustrade.