... .10 years factory 4.Professiona Steel Drainage Grating:Steel Drainage Grating Application:Widely used in electricity, petrochemical, chemical ... suspended ceiling, ventilation and penetration of light, steel grating fence,etcSteel Drainage Grating Characteristics:light weight, high bearing capacity, safe , ... 50G505/60/50G555/60/50G605/60/50 Anping JiaSheng Metal Product Co.,Ltd. Add :vanized Zone,Anping, ...