... A123,SS400 4.Common pitch:30mm&40mm 5.Used in flooring,walkway A leading professional producer, ISO9001-2000 COMPANY , GRATING SPECIALIST ... . Such as steelmill black and hot dip Galvanizingand stainless grating flooring walkway, platform and steel structures, stair tread, well cover, trench ... /60/50G205/60/50G255/60/50 galvanized annular steel grating flooring