Performance Decking Screws The High Performance Decking Screw featuring: Pozi Square Head – For versatile application with multiple driver bits. Self-Countersinking Ribs – For improved countersinking and a flush finish. Locking Thread – Allows the screw to lock the decking board giving no board movement. ACQ Corrosion Resistant Coating – A minimum of 1000 hours on a salt spray test. Serrated Thread – Cuts into wood reducing splitting and torque. Type 17 Cut Point – Reduces splitting and the requirement for pre-drilling.