The Macsim 304 Stainless Decking Screw is a 10g x 50mm stainless steel decking screw ideal for fixing into hard/soft timbers and good for exposed locations. These decking screws let you create cleaner, stronger and more professional fastener holes every time. It has a pre-drill and countersink, with a self-embedding head and a No.2 square drive for less wear and more torque.