Pan Phillips Self Tapper Screws create (taps) it's own thread as the screw is being driven in. Pan heads feature a flat dome style rounded head and a flat underside designed to provide maximum holding power on flat surfaces. Suitable for: Can you be used in light gauge steel aluminium certain plastics and timber. To ensure the best result it is recommended to always drill a pilot hole Material / Coating: Zinc Plated is the most common fastener of plating due to its the low cost and shinny bright silver finish. A thin layer of Zinc is applied by either electroplating or mechanically. It is intended to be used internally whilst some people use it externally it isnt recommended if corrosion may be a concern instead search our Stainless steel range Fastener length: is generally measured from the point where the surface of the material will be when the fastener is installed to the end of the fastener. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person and Bolt and Nut Australia is not responsible for any loss claim or damages arising therefrom.