Material:Mild steel.. Size:Standard,OEM High ... bar grating:1.) Processing technic:Steel grating is made by bearing bar and cross bar according to the flat ... arrangement, in high-pressure spacing on resistance welder welded by cutting, incision, opening, overlock process such as ... lid, manhole cover, ladders, fences, guardrail etc. 4.)Material: Carbon steel, Stainless steel ,and so on .5.)Surface ...