... buffering 1.product profile Phillips pan head combined screw fasteners are consisted of a screw ,a spring washer, ... and protect the machine .Item NamePhillips pan head combined screw fastenersMaterialStainless steel,carbon steel,or as your ... kinds df styles are available. head styles: pan head, binding head, truss head,round head, hexagon head ,ect. screw drivers: phillips, slotted, tamper, pozidriv, ...