Features; • 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 for ultimate performance and 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