The Centurion Twin Thread Woodscrews feature a zinc plated finish and are designed for superior performance in various materials including softwoods, hardwoods, chipboards and fibreboards. These 1 1/4 inch screws feature an extra deep insert bit recess for positive drive control and twin thread technology that enhances insertion speed and holding power. The countersunk head design ensures a flush finish with the substrate surface, while the zinc plating provides corrosion resistance.