... 3.function:fastening and buffering 1.product profile Phillips pan head combined screw fasteners are consisted of a screw ... parts' overwhelming pressure, and protect the machine .Item NamePhillips pan head combined screw fastenersMaterialStainless steel,carbon steel,or as your ... hexagon head ,ect. screw drivers: phillips, slotted, tamper, pozidriv, square,ect. We can produce it as your request.