... -1250mm (1000mm,1200mm,1250mm)Inner diameter: 508mm CQ: commercial quality DQ: drawing quality Base metal: HGI, CRCoating materials: Polyester Colour choice: All ... use ,roofing, commercial use, household appliance, industry, familySPECIALAPPLICATIONWear resistant steel, high- strength - steel plate Our certificate