The Hillman Self Drilling Cement Board Screw (#8 x 1-5/8") is designed for attaching cement board to wood or light-gauge metal studs. The screw drills its own hole, taps mating threads, and fastens firmly in one operation, special rib design under the head countersinks for flush seating in the board. It has a 1000-hour gray ceramic coat for superior rust and corrosion protection, making it ideal for projects like bathtubs, showers, countertops, and flooring applications.