Ideal for a wide range of projects - Suitable for use with many materials. - Countersunk heads are designed to sink flush with substrates to leave a smooth surface finish. - Twin threads enable an easy start when driving. - Resistant to corrosion. These zinc plated general 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 and the twin thread also increases speed, holding power and ease of insertion.