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, compatible with most metric 20 Series aluminum profile extrusions. T-slot aluminum extrusion hardware T-nuts made from high-quality carbon steel, galvanized with nickel plating for enhanced rust resistance, high hardness, and extended service life. High-quality carbon steel hex socket button head bolts, screws, and nuts with chrome-plated finish for anti-corrosion, rust resistance, and durability. Suitable for use in home and office appliances, communication equipment, ship assembly, and various machinery applications. Color: Silver Material: Carbon steel Dimensions: 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 variations in the color shown in images compared to the actual item. Measurement may vary by 13 cm.