Our 'Quick-Fit' corner connectors are made from heavy gauge hot-rolled steel. They are jig-cut and jig-welded (mig) to insure a precise and consistent fit (these are not a cheap bent tube corner). Each tube on each connector has a welded nut with an eyebolt (not shown on drawings below), which when tightened to the conduit gives an overall 'locked' rigid frame. Each connector is then plated against corrosion.