The Centurion 2½ inch Twin Thread Woodscrews feature a zinc plated finish and are designed for superior performance in various materials including softwoods, hardwoods, chipboards and fibreboards. These screws include an extra deep insert bit recess for positive drive engagement and twin thread technology that enhances speed, holding power and ease of insertion. The countersunk head design ensures a flush finish with the substrate surface, while the zinc plating provides excellent corrosion resistance.