Made of aluminum alloy material, these corner brace connectors are anti-rust, wear resistance, and safe for long time to use. Precision mounting hole, easy to install, can greatly save your time and efforts. Not easy to deform or break, it has strong connection function of aluminum profile slot, can connect two aluminum profile together. Features -Color:Silver. -Material:Aluminum alloy. -Size:4.00X4.00X3.60cm/1.57X1.57X1.41inch. -Hole diameter:0.80cm/ 0.31inch. -Note:Two holes type, mm screws and 4040 series M8T nuts are recommended. -Application: Compatible with 4040 Series Aluminum Extrusion Profile. - Made of aluminum alloy materials, these corner connectors have high hardness, strong and sturdy. - Suitable for internal connection and fixing of most 4040 series profiles, very professional and universal. - Easy to install by screws, has good hardness, will not be easily damaged or broken. - Detailed workmanship, in use, widely applied for building industrial aluminum frame structures. - Multi-functions, these connectors are perfect for 3D printers, CNC routers, machine guards, robotics projects and more. Package list: 10 x Corner Brackets