(1)Standard: DIN.JAS.AS.ISO (2)Material: steel,zinc plated /copper /aluminum (3)Size:M2~M10 (4)Finish: passivation,zinc, et different head can be supplied, hex, flat, round, countersunck, ect.(1)Standard: DIN.JAS.AS.ISO (2)Material: steel,zinc plated /copper /aluminum(3)Size:M2~M10(4)Finish: passivation,zinc, et