These Decking Screws have been green treated and hardened for excellent corrosion resistance, long lasting durability and protection against all weather. The Pozi screws feature an extra-coarse thread for enhanced holding power and high performance in all types of timber decking. The screws have been specially designed to accommodate the natural movement of wood in different temperatures without splitting during expansion and contraction. The countersunk design of the screw enables it to sit flush for a smooth surface finish. This Trade Tub contains 1000 x Green Decking Screws 4.5mm in diameter and 60mm in length.