4921 Stainless steel stairs, ladders and balustrades (3) Stainless steel stairs, ladders, handrails, balustrades and barriers 4922 Stainless steel floor trench linings, pit covers and floor and roof hatches (1) Stainless steel linings to trenches and recesses, covers and gratings, with associated frames, to floor pits, manholes, inspection chambers and trenches, and frames and covers to openings in floors and roofs 4923 Fire-rated stainless steel covers and frames (0) Fire-rated stainless steel floor and roof hatches, covers and access panels 4924 Miscellaneous stainless steel metalwork (9) Miscellaneous stainless steel items including bollards and protective devices, storage racks, and minor supporting devices 4925 Thin sheet stainless steel items (0) Items fabricated of thin sheet stainless steel, including casing to structural members