A scaffolding tube and coupler is a widely used structure at most jobsites. It represents a temporary and safe work platform to aid in the construction, maintenance, repair, access, audit, etc. If we were to classify the types of scaffolding according to the intrinsic mechanical differences of the many models, we would say that there are 3 types of scaffolding used on construction sites, such as tube and coupler scaffolding, H-frame / façade scaffolding and multidirectional scaffolding.http://www.lefinsteel.net/scaffold/scaffolding-tube/