Decking demands not only that weather-resistant wood be used, but also the right fastening materials. SPAX decking screws are made of stainless steel (A2, A2 antique or A4). The SPAX CUT point and characteristic SPAX ground serrations easily penetrate the wood, the fixing thread ensures the decking boards are secured tightly to the substructure and the cylindrical head can be countersunk easily into the wood.