The Bomb Shelter features an innovative spreader bar that keeps the frame rigid and the bed tight. It is made with 1-1/8" (28.5 mm) aircraft-quality 6061-T6 tubing for maximum strength and rigidity. We use CNC milled corner fittings for maximum strength, light weight and easy set-up. Anodized poles and corner fittings keep the parts from galling and sticking for easy set-up, corrosion resistance and durability. The heavy-duty bed is doubled in the high-stress, center section and employs Durathane™ haul bag material for wall-side abrasion guards.