... head,Hex flange head,Round head,Ball head,Button head...Socket typesPhillip type,Pozi type,Eleven type,hexagonal type,Torx type ... years experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench and so on .2. Our company had good reputation with ... is much thicker ,it is strong not break down . meanwhile,socket is much deeper,it is convenient to tighten by screwdriver ...