... head,Bugle head, Oval head, Hex flange head, Button head,Triangular head , Round head, Ball head ,Spherical Cheese Head,Hexagon socket head , etc.3.Drive type: Slotted, Phillips, Hex Socket, Torx ... zinc-plated,rust preventive oil, titanium alloy galvanized, silver plating, ... lathe, springs, shafts, screws, stamping parts and other ... STEEL HEXAGON SOCKET HEAD BOLTS DIN912ATANDARD:DIN912 /ISO4762SIZE:M3 ...