Structural framing systems are components and accessories used to build industrial and commercial structures such as carts, shelving, enclosures, machine guards, and workstations. They consist of extruded aluminum profiles and connectors that are assembled without requiring welding. These assemblies can be extended, taken apart, and reassembled as needed. T-slot structural framing systems have recessed T-slots in the profiles that accept fasteners for creating joints or mounting components. Square press-fit structural framing systems are built using press-in connectors that don't need fastening hardware (boltless method).