Suitable for 3030 series aluminum profiles.Constructed from zinc alloy material, nickel plated finished, wear-resistant and durable to use.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. Specification:Material: Zinc AlloyFinish: Nickel PlatedThickness: 8mm / 0.31"Hole Quantity: 2Hole Size: M6Slot: 8mm / 0.31"Total Size: 37mm x 14mm x 31mm / 1.46" x 0.55" x 1.22" (L*W*H) Package Content:10 x 3030 Series Angle Brackets20 x Screws.