Advanced engineering, heavy duty industrial grade materials, and manufacturing facility control all blend together to create a staging system with extraordinary durability and long life, whether used indoors or out. Inter-Lock utilizes only rust-proof aluminum extrusions and castings with stainless steel fasteners. Inter-Lock is certified by independent, registered professional engineers to meet or exceed national commercial building codes. Handrails are aluminum pipe securely fastened to the stage and stair decks. Standard netting prevents children from climbing rails and slipping off the edge.