Such blind nut sometime needs a tool to operate with, widely be used in steel furniture system, especially steel cabinets. It's mainly to combine few pieces of steel plates and offers internal thread fuction.
1. M4-0.7 x 11.7L.
2. M5-0.8 x 13.1L.
3. M6-1.0 x 15.75L.
4. M8-1.25 x 18.65L.
5. M10-1.5 x 18.65L.
6. More dimension is available upon inquiry.