An economic but highly effective softwood decking screw. Plated to withstand up to 500 hours in a salt spray cabinet and designed to give a rapid installation and a secure fixing. Ribs under head for improved countersinking Helix shank for removing debris and to improve clamping 25 sharp point and single lead for a fast start and improved thread acceptance" Thread Dia. mm: 4.5 Length mm: 70 Thread Length mm: 50 Head Type: Double Countersunk with Ribs Recess Type: Pozi Point Type: 25 Sharp Driver Bit Size: PZ2 Finish: Exterior (Green Organic) Material: Carbon SteelSize 4.5 x 70 - 200 Pieces Timco Decking Screws - PZ - Double Countersunk - Exterior - Green