Steel Space Frame 1)Durable for 15 years at least 2)Firm ... Artistic 3)Hot Galvanized 4)Resuable, easy to install Steel Space Frame 1)Durable for 15 years at least 2)Firm ... and Artistic 3)Hot Galvanized 4)Resuable, easy to installNameSteel Space FrameMaterialC Purlin, H Beam, Sandwich panel, Hot Galvanised Steel, etc ... . Stairs could be outside Steel buildings. Low cost stainless steel space frame