Blackhawk BH109D Speed Drive 10g x 65mm 316SS TRS TX20 deck screw is a high-strength decking screw designed for long-lasting durability in marine or coastal applications. made from 316SS Stainless Steel, it offers excellent resistance to corrosion. the TRS thread and TX20 drive provide fast, secure installation in timber or composite decking, making it ideal for high-moisture environments.