Hidden Deck Fasteners from our decking range: quality surplus stock at a lower price than retail. Suitable for new builds, repairs and DIY projects. Pickup is free; shipping is available. Need a larger quantity or a different size? Send us a message. Photo: "4 SPAX screws with partial and full thread" by Unknown author, CC BY 3.0, via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:4_SPAX_screws_with_partial_and_full_thread.jpg).