... stair tread is fixed by steel bolts or welding, with nosing or not stair tread , steel stair tread ... with fixing by steel bolts or welding, with checker plate nosing or without nosing.ISO9001-2000 company, ... x 3/16'', 1'' x 1/4'', 1-1/4'' x 1/4'', 1 1/2'' x 1/4''(19-w-4),(19-w ... Mild Steel (Low Carbon Steel) or Stainless Steel5) Surface Treatment: Untreated, Painting or Hot dip Galvanizing6) Steel grating ...