... .5.Size:From M1.6 to M1006.Packing:25kgs/carton, 36cartons/pallet, or according to customer's requirement7.Certificatiojn: ISO9001 ... 18mm Surface treatment :Surrounded white zinc plating.or according to requestMaterial:Stainless steel/Iron,SK7Standard:DIN,BS,GB,JIS, ... , energy, electrical appliances, electronics, machinery, chemicals, metallurgy, automobile and other industries bolts and nuts screws