... gratings, and stair treads etc. Detailed Selling Lead Description steel grate, drainage grating is a NEW building material, it' widely ... facilityes,stadium,port,walkway,platform etc.Our main products are steel grating floor, trench cover, well cover, stair treads, ... 50, 100mm are recommended. 4? Material: Mild Steel (Low Carbon Steel) or Stainless Steel 5) Surface Treatment: Untreated, Painting or Hot ...