Chicago Metallic® 730 Stainless Steel 15/16" Exposed grid ceiling system is available in an intermediate-duty design, is roll formed entirely from 304 stainless steel, and is the most resistant of the Chicago Metallic™ grid systems to corrosion. Featuring demountable hook-end cross tees, this designer ceiling grid assembles quickly and easily. Chicago Metallic™ grid systems are third party certified to meet ASTM standards and are listed with ICCES Evaluation Services, reference report ESR-2631 for more information.