The C2 Advanced Timber Decking Screw is a premium decking screw using the C2 twin cut technology, coated with a patented multi-layer corrosion resistance plating to withstand up to 1000 hours in a salt spray cabinet. This innovative tip design enables the screw to rapidly penetrate the timber, cleanly countersink and securely clamp the decking board to the joist. The impact resistant head is strengthened to prevent sheering when installed with an impact tool. The ribs under the head improves counter-sinking and the helix is for removing the debris and improving clamping. The patented twin cut technology for rapid pickup and reduced splitting. The Timdrive T20 driver bit is supplied free inside the each tub. CE mark in compliance with the Screws for Structural Timber Products Regulations EN14952-2008.