Description:Suitable for 4040 series aluminum profiles.Made of aluminium alloy, which is firm and durable.The L shape 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. Specification:Material: Aluminum AlloyHole Quantity: 2Hole Size: 22x 9mm / 0.86" x 0.35" (L*W)Total Size: 40mm x 35mm x 40mm / 1.57" x 1.38" x 1.57" (L*W*H) Package Content:10 x 4040 Aluminum Brackets.