galvanized steel grating prices steel grating material:hot-dip galvanized ,stainless steel stair treads, ... , 50 x 7 x 4, 55 x 7 x 4, 60 x 7 x 4, 65 x 7 x 4, 70 x 7 x ... 4, 75 x 7 x 4, ....2) Bearing ... requirement and 50, 100mm are recommended, America standard is available. 4) Material:Mild Steel (Low Carbon Steel) or Stainless Steel5) Surface ...