Grip-Rite PrimeGuard Plus Star Drive Exterior Construction Screws are designed for a variety of outdoor construction applications. Ideal for general construction use, the green coating helps blend in with treated lumber in decks and siding. T 17, self-drilling points reduce the need for pre-drilling. Included T-25 Star Drive bit ensures at strong tool tip to fastener connection and compatibility on the job. Flat head countersinks easily and leaves a smooth, clean finish. Backed by the PrimeGuard Plus lifetime warranty, these fasteners are guaranteed for the life of your project. Get the job done right with Grip-Rite!