Check the listing for details. 100Pcs M6 Half Round Roll in Spring t Nuts 2020 Series t Slot Spring Nuts Silver. Condition: New. Listed at 23.61 USD. These half-round spring T-track nuts integrate seamlessly with 20 series aluminum profiles, providing efficient assembly. Widely used in 3D printer bases, CNC routers, industrial aluminum frame structures, robotics projects, milling fixtures, and custom furniture frames, etc.SpecificationsColor: SilverMaterial: Carbon SteelThread Type: M3Compatibility: 20 Series Aluminum Extrusions (6mm Slot Width)Size: 14 x 8.2 mm / 0.55 x 0.32 inch (L*W)Height: 4.2 mm / 0.17 inch, 5.2 mm / 0.2 inchPacking List: 100 Pcs x T Nuts Roll in SpringAdvantagesT-nuts are made of carbon steel, with high hardness, corrosion resistance, oxidation resistance, nickel plating on the surface, and good rust resistance. The spring mechanism can be quickly installed and firmly fixed in the T-slot.