THE WOOD SELF DRILLING SREW NAIL IS THE BEST FASTENER FOR ROOFING. ESPIECIALLY FOR ASBESTOS TILES. The wood self drilling srew nail is consist of 3 parts: steel crew nail, stell gasket and asphaltum washer.1, Srew nail: finished with hot dipped galvanised2, Total weight per set: 53gram3, Size: can be customed4, Packing: 25KGS per export carton Wood Self Drilling Screw Nail Used On Tile And Roof