{Used for} 4080 8080 aluminum extrusion profile for 8mm slot. M8 T-nuts shrapnel type design, fixed position is not easy to slide , high quality carbon steel galvanized manufacturing, good anti-rust performance, high hardness, long service life. {Package Content}6pcs 90 Degree solid 4080 aluminum corner bracket,24pcs M8 T-nuts, 24pcs M8 hex screw,1pcs wrenches tool. 4080 Series aluminum extrusion profile connector set widely used for build industrial aluminum frame structures, 3D printers, CNC routers, CNC laser cutters and robotics projects. etc. If you encounter any problems with this item, please do not rush to return it, feel free to email us via your order ID and we will do our best to resolve your issue. 4080 Series aluminum extrusion profile connector set widely used for build industrial aluminum frame structures, 3D printers, CNC routers, CNC laser cutters and robotics projects. etc.