Coupling Fasteners,Connecting 1.ISO,ANSI,CE,DIN,BS& non-standard fastener supply ... 3.Grade:4.8 ,6.8,8.8..... Coupling Fasteners,Connecting Fasteners,Aluminum Fasteners. 1.What’s the specification of our ... head,Hex flange head,Round head,Ball head,Button head...Socket typePhillip type,Pozi type,Eleven type,hexagonal type,Torx type ...