... 20 years experience in special fastener Name: hex nut with internal thread and castle screw Ability for the material of this kind ... ,C60600,C17200,etcAlumimum100,5052,6061,6063,etcAbility for the surface finish: ElectroplateZinc plated(while,colour,dacroment),Nickel plated,copper plated,gold ... have our own way to supply youthe high quality products with lowest price and delivery on time as we can.We ...