bolts and nuts 1.experienced manufacturer 2.we can do it as your request ... treatment, assembly, painting, casting ect.,3. bolts and nuts(1)Grade: 4.8 -- 12.9,A2, A4(2)Size: M3-M72(3 ... )Finish:plain, zinc plated, hot dip galvanized, dacroment(4)Material:Carbon steel, stainless steel(5)Packing: Standard export packing ...