Cement Board Screws are ideal for attaching cement-type board, or any dense sheathing to wood and light-gauge steel. You can use these screws for a variety of projects including bathtubs/showers, countertops and flooring applications. Special rib design under head countersinks for flush seating in board. Self-tapping threads provide maximum holding power. No pre-drilling is necessary. Simply install with a no. 2 phillips screw driver. Recommended for use with treated lumber.