【Size and Package】 M8 Roll Ball Elastic Nuts for 4040 series Aluminum extrusion profile, product size detail pls refer to Pics. Package include 10 pieces Roll-in T Spring Nuts. 【Material】Made from high quality 8.8 grade carbon steel, high hardness and a long service life. Nickel-plated surface provide good corrosion resistance. 【Feature】Roll ball elastic nuts with M8 thread. Used for T-slot aluminum profile 40 series. Easy to be roll into T slot of aluminum Extrusion profile. 【Ideal T nut】It can be directly into the aluminum slot hole in any of the assembly point. Back spring ball can be fixed its position which make installation very simple and reliable. 【Application】Widely used for build CNC routers, 3D printers, CNC laser cutters, CNC plasma cutters, robotics projects, 3D carvers, machine guards, workstations, etc. 1.It can be directly into the aluminum slot hole in any of the assembly point
2.Back spring ball can be fixed its position which make installation very simple and reliable
3.Profile connection is one of the most use of accessories
4.Made of 8.8 grade Carbon Steel and lasting performance

Note:
Since the measurement tools are different, there will be 1-2 mm error, does not affect the use.