[Size] - Total Size: 30 x 30 x 26mm / 1.18" x 1.18" x 1.02" (L*W*H); Material Thickness: 4mm / 0.16".[Material] - Constructed from aluminium alloy, anti-corrosion and durable to use.[Easy to Install] - With 2 mounting holes, Small Hole Dia: 7mm / 0.28"; Big Hole Size: 18 x 7mm / 0.71" x 0.28" (L*W). Use screws to fixed.[Package] Content: 8 x Corner Bracket, 16 x Screw, 16 x Nut. Please check the size you need before purchase. Mounting screws and nuts are included here.[Applications] - 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. Widely used for building industrial aluminum frame structures, 3D printers, CNC Routers, CNC laser cutters, Robotics Projects.