Bolts Grade 4.8 6.8 8.8 10.9 meterial: Q235 A3 45# 40CR Finished: plain,black,zinc plated and HDG BoltsWe are the factoryStandard: BS DIN ANSIGrade 4.8,6.8,8.8,10.9/2.5meterial: Q235 A3 45# 40CRFinished: plain,black,zinc plated and HDGDiameter:M6-M56 L:12--500MM 1/4"---2-1/2" L:1/2"---20"