Forgefix twin thread multi-purpose woodscrews designed with a countersunk pozidrive head. Perfect for softwoods, hardwoods, chipboards & fibreboards. Coated with a unqiue wax to increase speed and ease of insertion. Great for both trade and DIY. These Forgefix General Purpose Pozi Compatible Screws with Countersunk heads are zinc plated for increased durability. They are an extremely popular general purpose screw, and suitable for use in and with many materials. Zinc coatings prevent oxidation of the protected metal to create a longer lasting finish. The Pozidriv screw has four additional points of contact and does not have the rounded corners that the Phillips screw drive has, allowing great torque to be applied. The countersunk head is designed to sink flush with substrates to leave a smooth surface finish. They have twin threads, which enable an easy start when driving.