1. Sinosteel-Fortune 500 company 2. ISO9001:2008 management 3. 8 types by welding or bolt to stringer 4. FRP nosing available 1. Steel Stair Tread TypesT1: Welded fixing, banded ends, no nosingT2: Bolted fixing, holed end plates, no nosingT3: Welded fixing, banded ends, checkered plate nosingT4: Bolted fixing, holed end plates, checkered plate nosing1.5 Welded fixing, banded ends, nonslip nosing1 ...