Double End Bolt,Special 1.ISO,ANSI,CE,JIS,DIN,BS& non- ... .Grade:4.8 ,6.8,8.8,9.8... Double End Bolt,Special Head Bolt,Bolt Maker ,M6 Bolt Dimensions1.What ... much thicker than some other manufacturers ,it is strong not break when you tighten the fasteners by wrench ,key ,bit and ...