High Performance Wafer Head - Structural Timber Screws- Box High Performance Wafer Head Up to 1000 hr salt spray resistance. No pre-drilling in most timbers. ACQ resistant coating. Type 17 point to reduce drive torque, 6.7mm diameter with specially designed serrated milling thread. Each box comes complete with Torx Drill Bit driver for easy application. Efficiently and securely fasten structural timber with our High Performance Wafer Head Screws. With up to 1000 hr salt spray resistance and ACQ resistant coating, these screws are built to last. The Type 17 point and specially designed serrated milling thread reduce drive torque, while the included Torx Drill Bit driver makes application a breeze.