Theses SPAX Screws are the best decking screws that you get on the market. As you can see on the picture it has a double thread. The first thread sits tight into the substructure and the second thread below the head sits tightly into the decking plank

•  Fixes the planks to your substructure
• The small cylindrical head lies flush in the wood, achieving an appealing aesthetic finish.
• length 50mm

These screws come in boxes of 200 screws. Please select how many boxes you need.