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Boeray 10pcs Black T Slot L-Shape Interior Inside Corner Connector Joint Bracket with Screws and Wrench Tool for 4040 Series Aluminum Extrusion Profile Slot 8mm Material: Electrophoresis Zinc alloy , has excellent features in high abrasion resistance, rust proof and stability . Packed: 10 L joints + 20 sets screw + 1 wrench for set screw,more convenient than L-Shape only Advantage:Concealed corner brace, the L corner bracket can be completely hidden in the slot of the aluminum extrusions Fit:Suitable for 4040 european standard aluminum profiles slot 8mm Widely used for building industrial aluminum frame structures, 3D printers, CNC routers, laser engravers, robotics projects