Features: 1)Standard: DIN 913,DIN 914,DIN 915,DIN 916.2)Size: M3 x 4 to M12 x 60.3)Material: alloy steel,stainless steel 200,304.4)Grade: 8.8,10.9,12.9,A2.5)Thread: metric or inch size.6)Finishing: zinc plated,black oxided.