1. shelves structure is simple, safe and reliable, can be adjusted portfolio items out of storage from the order restrictions. 2, column by column pieces shelves, cross brace, brace bolted together. Column plate and C-hold plug weld beams composed of the shelf frame, using safety pins fixed, simple and reliable construction. 3, the beam by two columns and beams rods welded together card, using two beams hold a special type welding beam welding, so the beams below to thicken doubled. 4 shelves after the first column piece uses automatic punching roll forming technology, avoiding the stress concentration may lead column column failure to crack the case. Ensure product durability! 5, the surface paint, custom color customers.