Check the listing for details. 50Pcs M4 T Spring Nut Half Round T Nut Tee Slot 2020 Series. Condition: New. Listed at 13.75 USD. Description:[Material] - T spring nuts made from high-quality carbon steel, these nuts have high hardness and a long service life surface is Nickel-plated for good rust resistance and better performance.[Wide application] - The spring ball tee nuts are extensively utilized in constructing 3D printers, CNC routers, robotics projects, and industrial aluminum frame structures. [Feature] - The roll ball elastic t-nuts, have clean thread and can be placed directly into the aluminum slot hole in any of the assembly points, making your job easier [NOTE] - These nuts are small in size. As such, they should be stored in an inaccessible location for children's safety.Specification:Material: Carbon SteelFinish: Nickel platedColor: Silver ToneM4 Size: 13x8.2x4.4 mm / 0.51x0.32x0.