The SPAX stainless steel decking screws are designed for optimal performance in outdoor and marine environments. These screws are 5mm x 40mm in size and feature a fixing thread, cylindrical head, and T-star plus T25 cut point. With a pack of 200 pieces, these screws are ideal for large decking projects. The stainless steel construction ensures durability and longevity, and the cylindrical head and T-star plus drive offer easy and secure installation.