... product lines are:steel rating,perforated metal filter used in hammer mill ... sheet,punching hole metal,punched hole metal sheet, perforated metal screen... perforated metal products--steel gratingmaterial ... :stainless steelhole*pitch:50*50application:platform,catwalk,stairsMaterial:stainless steel(stainless steel304,0CR18Ni9,stainless steel316),mild steel,Aluminum ...