Ideal for a wide range of projects - Zinc yellow passivated finish for increased durability. - Suitable for use with many materials including timber, chipboard, MDF, PVCu and similar materials. These multi purpose screws are ideal for fixing into a range of substrates including softwoods, hardwoods, chipboards and fibreboards. The extra deep insert bit recess allows a more firmer positive drive whilst the single thread design provides increased holding power particularly when used with particle boards like MDF. These screws are also more corrosion resistance than zinc plated products thanks to an additional passivation process.