2020 Series L Shape Joint Plate Bracket Kit,4pcs Joint Plate,20pcs M5 T-Slot Nuts, 20pcs M5x8mm Hex Socket Cap Screw,for Standard 6mm Slot Aluminum Profile. Finish Type: Nickel. Finish: ‎Nickel. T-Slot Aluminum Extrusion M5x8mm 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.