A wall is then constructed round the brackets. Then the finished treads are bolted in place. These treads could be of steel or wood or Wooden clad steel. Cantilever techniques need to be created by a structural engineer, making sure that they remain horizontal and rigid with use with time. https://allkindsofsocial.com/story5141937/the-smart-trick-of-cantilever-staircases-that-nobody-is-discussing