... ' overwhelming pressure, and protect the machine .Item NamePhillips pan head combined screw fastenersMaterialStainless steel,carbon steel,or as your demandFinishZinc,colourzinc,nickel ... . Nearly all kinds df styles are available. head styles: pan head, binding head, truss head,round head, hexagon head ,ect. screw drivers: phillips, slotted, tamper, pozidriv, square ...