Our co***ny manufacturing all kinds of rivet nuts,the main products are flat head(ABK/HB),countersunk head(ABK/HB),hexagon shat(ABK/HB) and so on。The specification are m3-m12��systerm of US 5/16、1/4UNC、3/16、10-24、10-32、8-32,systerm of British 3/16-24、3/16 and so on