TIMCO C2 Exterior Multi-Purpose Premium Countersunk Silver Woodscrews - 4.0 x 30 All the features and superior performance of the C2 screw complete with an organic plating for optimal corrosion resistance when used in the harshest of environments. Silver colour to match commonly used ironmongery. Ideal for many general external applications. C2 Strong-Fix Exterior PZ2 CSK Ribs under head for improved countersinking Special plating to give 1,000 hours salt spray resistance Multi-layer coating consisting of organic top coat barrier and a zinc base layer Dual angle thread gives an ultimate performance and an exceptionally high pull-out resistance Patented twin cut technology for rapid pick-up and reduces timber splitting All sizes up to and including 75mm are fully threaded and lengths 80mm and above all have 70mm thread length