A4 (also known as Marine Grade) stainless steel contains a small amount of molybdenum, which creates a particular type of steel having a much higher resistance to surface corrosion when compared with standard A2 stainless steel. The screws have a Torx head ensuring the virtual elimination of 'cam out', where the screwdriver is liable to slip under pressure, damaging both the screw head and the bit. Screw threads are also wax lubricated for almost effortless driving into most timbers. These screws are suitable for all outdoor projects such as garden furniture, timber framing, sheds as well as boat building and renovation. Boxes of 200. Except 5 x 60mm wood screws which are boxes of 100.