... head,Hex flange head,Round head,Ball head,Button head...Socket typesPhillip type,Pozi type,Eleven type,hexagonal type,Torx type ... ,trangle type,slotted point type,square type,Combined type...FinishZinc plated,Nickel plated,Dacroment ... is much thicker ,it is strong not break down . meanwhile,socket is much deeper,it is convenient to tighten by screwdriver ...