Rpi Shop M3 (Pack of 50) T Nut (Hammer Head) is made from high quality carbon steel, have a good rust resistance. Used for T-slot aluminium profile 2020 series. Suitable for 20mm series T slot european aluminium extrusion, Use to build CNC routers, 3D printers, CNC laser cutters, CNC plasma cutters and robotics projects etc. Made from high quality carbon steel, have high hardness, surface is Nickel-plated for good rust resistance. Used for T-slot aluminium profile 2020 series. Easy to be roll into T slot of aluminium profile. Suitable for 20mm series T slot european aluminium extrusion, Use to build CNC routers, 3D printers, CNC laser cutters, CNC plasma cutters, robotics projects, 3D carvers, machine guards, workstations and more. Made from high quality carbon steel and have a long service life. And the special construction can be directly into the aluminium slot hole in any of the assembly post, back spring ball can be fixed its position which make installation very simple and reliable. Their new patented locknut design makes them easier to use than traditional locking nuts. Widely used for building industrial aluminium frame structures, 3D printers, CNC Routers, CNC laser cutters, robotics projects. This t-nut is made from high quality carbon steel, have high hardness, surface is Nickel-plated for good rust resistance. Used for T-slot aluminium profile 2020 series. Easy to be roll into T slot of aluminium profile. Suitable for 20mm series T slot european aluminium extrusion, Use to build CNC routers, 3D printers, CNC laser cutters, CNC plasma cutters, robotics projects, 3D carvers, machine guards, workstations, etc.