Why choose us, universal size be matched to extrusion profile. , made of hard zinc alloy, advanced anti-rust painting treatment, wear and rust resistance, , . Precision mounting holes, effortless installation, saving your time. Features - Color: Silver. - Material: Zinc alloy. - Size: 5.50 x 5.50 x 3.00cm/ 2.16 x 2.16 x 1.18 inch. - 3-way end corner bracket connector for aluminum extrusion profile with screws. - Widely used for building industrial aluminum frame structures, 3D printers, CNC routers, robotics projects. - With mounting screw, simplicity and convenience, saving of work, time and labor for installation. - The surface is subject to sand to achieve elegant appearance. - Made from zinc alloy, high hardness and a for good rust resistance and better performance. Package list: 4 x connectors 8 x screws