A premium decking screw using the C2 twin-cut technology. Coated with a patented multi-layer corrosion resistant plating to withstand up to 1,000 hours in a salt spray cabinet. This new and innovative design enables the screw to rapidly penetrate the timber, cleanly countersink and securely clamp the decking board to the joists. The collated strips are specifically designed to be compatible with all leading power tool brands. The collated strips are specifically designed to be compatible with all leading power tool brands" Thread Dia. mm: 4.5 Length mm: 65 Thread Length mm: 42 Head Type: Countersunk with Ribs Recess Type: Square Point Type: Twin-Cut Driver Bit Size: SQ2 Finish: Exterior (Green Organic) Material: Carbon SteelSize 4.5 x 65 - 500 Pieces Timco C2 Deck-Fix Premium Collated Decking Screws - SQ - Countersunk in Green