T Nuts Tee Sliding Slot Nuts 20 Series M3 Threaded Slide in Pre-Assembly for 20x20 Aluminum Extrusions Frame with Profile 2020 Sereis 6mm Slot for CNC Router Build Rail 3D Printer 50pcs 40Series M5-8Pack
High quality carbon steel, moisture resistance, oxidation resistance, corrosion resistance, healthy and lead-free. High hardness, twice as hard as copper.