Hope offers metal building frames main categories:CS Clear Span, MS Multi Span, CL Classic, HS High Span, SST Single Slope, SSS Single Slope, LT Lean-To, Customo Designs. Our primary framing acts as a single unit after assembly that will support the load of the finished structure while transferring the weight to the foundation. 1.Solid Built-up I-beam main frame construction; 2.high strength plate steel; 3.Submerged Arc/welded Frames.