Suitable for 3030 series aluminum profiles.Main components are 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: 2Thickness: 3.8mm / 0.15"Hole Diameter: 6mm / 0.24"Total Size: 30mm x 26mm x 30mm / 1.18" x 1.02" x 1.18" (L*W*H) Package Content:6 x Aluminum Brackets.