2020 Series Aluminum Profile Connector Set widely used for building industrial aluminum frame structures, 3D printers, CNC Routers, CNC 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 M5x10mm Hardware Slide In 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 colour:Silver Material:Aluminum alloy Package Contents: 20 x corner stand 40 x M5 x 10mm T-nuts 40 x M5 x 10mm screws Only the above package content, other products are not included. Note: Light shooting 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.