1) The steel spine is used for carrying treads in the wood-steel staircases;

2) For the risers, there\'re 2 types for choosing: the height-adjustable twin tubular bar and the height-fixed mono tubular bar;

3) Welded steel spine and self-assembled spine for choosing;

4) Material: q235 common carbon steel;

5) Colors: black, milky white, flash silver;

6) Specifications: both standard and custom made available, pls contact us for details;