Characteristics: 1. Treatment of thin sheet. Install these nuts on sheet with thickness of no less than 0.6mm. 2. Materials which is difficult to joint with. These nuts can be used on steel materials which is hard to joint with, and also on materials such as aluminum, stainless steel and plastics. 3. High installing strength The part under head has its unique shape, when it is pressed in, the materials are fixed, and higher installation strength is obtained. 4. Easy installation 5. No need for special tooling, air pressure and hydraulic pressure would be enough for simple installation. 6. The opposite side of nut is flat while the surface is not. 7. Still can be used after surface treatment. Materials Sizes Surface treatment Steel M2 M2.5 M2.6 M3 M4 M5 M6 M8 M10 M12 M16 M20 Cementite(smooth)plating Stainless Steel M2.6 M3 M4 M5 M6 M8 Brass M3 M4 M5