... -boltsStandard: GB37,DIN,JIS,ANSIGrade:Class 4.8, Class 6.8, Class 8.8, Class 10.9, Class 12.9Size: M(6--10)*(16-100mm)Detailed Description ... A2(304),A4(316)SizeM(6-10)*(16-100mm)GradeClass 4.8, Class 6.8, Class 8.8, Class 10.9, Class 12.9StandardGB37,DIN,JIS ...