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 #2 Phillips screwdriver. Recommended for use with treated lumber.