... recommended.Surface treatment:G - galvanizedP - paintedU - untreatedGrating standard:China: YB/T4001.1-2007(YB/T4001.1-1998)Britain: BS4592 ... Belt corridor, storage shelf,Attic panel, trestle, guardrail, sunshade gate, etc. Notes for ordering:1. Please clearly state specifications, ... plan, structural drawing, sectional view and joint drawing.supply OEM. 3. In the case of stair treads, please specify ...