2020 Series Aluminum Profile Connector Set widely used for building industrial aluminum frame structures, 3D printers, CNC routers, CNC laser cutters, and robotics projects. Cast aluminum corner bracket used to connect pieces of 20mm aluminum extrusion at a 90-degree angle, suitable for most metric 20 Series aluminum profile extrusions. T-slot aluminum extrusion hardware T-nuts made from high-quality carbon steel, galvanized with nickel-plated surface for good rust resistance, high hardness, and long service life. High-quality carbon steel hex socket button head bolts, screws, and nuts with chrome-plated finish for anti-corrosion, rust resistance, and high hardness. Widely used in home and office appliances, communication equipment, ship assembly, and other machinery industries. Color: Silver Material: Carbon steel Size: Nut size: M5 x 10mm Screw size: M5 x 10mm Package Contents: 20 pcs 20mm 90-degree solid cast aluminum corner brackets 40 pcs Carbon steel galvanized M5 x 10mm T-slot nuts 40 pcs Carbon steel M5 x 10mm hex socket cap screw bolts Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.