our products is ranged from car accesory,volve accesory,2H screw,also, we also produce US. bolt with the series of UNC,UNB ranged from 2A to 3A with American standard. We are excecuting the standard of ASTM 193/B7¡¢B7M,ASTM A320/L7L7,ASTM A194/2H¡¢2HM throughout the processing of the production.