Double End Bolt,Special 1.ISO,ANSI,CE,JIS,DIN,BS& non-standard fastener ... ,6.8,8.8,9.8... Double End Bolt,Special Head Bolt,Bolt Maker ,M6 Bolt Dimensions1.What’s the specification of our Products ? MaterialsCarbon ... steel,Alloy steel,Copper,Aluminum are available.Carton steel is high quality iron,such as 1022,1018,1010,1008,1015...Medium carbon ...