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Concealed corner brace, the L corner bracket can be completely hidden in the slot of the aluminum extrusions. The L shape hidden corner bracket used for setting up a right angle connection of the two aluminum profiles, insert the two ends of the L bracket into the groove of the profile, and tighten the set screw to fix the two profiles. Built-in connection with beautiful and simple features. Widely used for building industrial aluminum frame structures, 3D printers, CNC Routers, CNC laser cutters, Robotics Projects. Package List: 25 x Hidden cast zinc corner bracket 50 x M4*5 set screw 2 x Allen key