Bronze Star Exterior Coating Compatible with pressure treated lumber and can be used with tannic wood such as Cedar and Redwood * Star Drive offers twice the torque over Phillips or square drive screws * True Flat Head with Self-countersinking Nibs and Drag Reducing Knurled Shoulder * Type 17 Notched Extra Sharp Point reduces the need for pre-drilling * Tiny Cuts on the Threads Reduces the Torque needed to drive the fastener