2020 Series Aluminum Profile Connector Set widely used for building industrial aluminum frame structures, 3D printers, CNC Routers, CNC laser-cutters, Robotics Projects Cast Aluminum Corner Bracket used to connect pieces of 20mm aluminum extrusion at a 90 degree angle suitable for most of metric 20 Series Aluminum Profile Extrusion T-Slot Aluminum Extrusion Hardware T-Nuts made from high quality carbon steel Galvanized,surface is plated with nickel for good rust resistance and better performance high hardness and a long service life. High Quality Carbon steel Hex Socket Button Head Bolts Screws Nuts Surface chrome finish Anti-corrosion,rustless,non-pollution and high-hardness.used widely in the home and office appliance, communication equipments, ship assembly and other machinery industry Color: silver Material: carbon steel size: Nut size: M5 x 10mm Screw size: M5x10mm Package Contents: 20pcs * 20mm 90 Degree Solid Cast Aluminum Corner Bracket 40pcs * Carbon Steel Galvanized M5 x 10mm T-slot Nuts 40pcs * Carbon steel M5x10mm Hex Socket Cap Screw Bolt Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.