Make the most of your of your outdoor project with DECKMATE brand exterior screws. Designed for use with all treated lumber and all exterior projects to connect wood to wood. A lifetime polymer coating provides extra corrosion resistance that is guaranteed for the life of your outdoor project.. Star drive head helps transfer torque and prevent cam outs. Nibs under head allow screw to countersink better for a smoother finish. Type-17 point with flute creates its own pilot hole limiting the need for pre-drilling. Includes T-25 driver bit in the box. Screw Length: 2-1/2 in. Size: #9. Drive Style: Star. Interior/Exterior: Exterior. Package Quantity: 1823. Head Style: Flat Head. Weight (lb.): 25 lb. Fastener/Connector Material: Steel