... fastening and buffering 1.product profile Phillips pan head combined screw fasteners are consisted of a screw ,a spring ... washer, a flat washer.It is generally used in home appliance, furniture field, electronic procucts, ect. ... pressure, and protect the machine .Item NamePhillips pan head combined screw fastenersMaterialStainless steel,carbon steel,or as your demandFinishZinc,colourzinc ...