Torque X-Cages differ with X-Racks only in that they have their own self-supporting base.  They are built with the same materials and components and take many of the same attachments.  The bases are built with 3″ x 3″ 11 gauge tubing for ultimate stability and include raised L-Brackets eliminating end caps, providing 4-point contact and allowing the systems to be secured to the floor if desired.