The TIMCO Heavy Duty Timber Screws Hex Flange Head Exterior Silver – 8.0 x 200 are designed as an alternative to traditional coach screws, dramatically decreasing installation time as they don’t require a pilot hole into most wood types. These heavy duty screws are ideal for external applications or where extra strength is required. They feature a hex head countersunk with a fixed washer, 50° deep single thread to provide secure fixing with high pull-out resistance, and a single slash point to reduce torque and risk of timber splitting. The screws are coated with a patented multi-layer silver corrosion resistant plating that withstands 1,000 hours salt spray test, and the helix design removes debris and helps improve clamping.