The CENTURION 3.5mm x 20mm Stainless Steel Chipboard Screws feature a twin thread design for superior holding power and easier insertion. These versatile screws are ideal for multiple substrates including softwoods, hardwoods, chipboards and fibreboards. The extra deep insert bit recess ensures firm positive drive, while the stainless steel construction provides excellent corrosion resistance making them perfect for marine, coastal and sanitaryware applications. The countersunk head design allows for a flush finish with the substrate surface.