... certificate. Fast delivery,7-30 days Structural Building Material --bar grating: 1.) Processing technic: steel grating is made by bearing ... by cutting, incision, opening, overlock process such as processing and into customer requirements finished products. 2.) Features: intensity ... ditch lid, manhole cover, ladders, fences, guardrail etc. 4.)Material: Carbon steel, Stainless steel , and so on . 5.) ...