Made from zinc alloy, high hardness and a long service life for good rust resistance and better performance. Easy to use: it can be easily inserted into the end of the profile and then fixed with screws. Fit 20x20 series 6mm slot Aluminum extrusion profile, Used to connect pieces of 20mm aluminum extrusion at a 90 degree angle. 2020 Series aluminum extrusion profile 3-way end corner bracket solid connector widely used for build industrial aluminum frame structures, 3D printers, CNC routers, CNC laser cutters and robotics projects etc. Package Include: 8pcs 3-way end corner bracket solid connector, 32pcs screws.