Backer-On No. 9 X 2-1/4 in. L Star Round Head Cement Board Screws 100 pk

The Backer-On 2-1/4 in. Cement Board Screws are designed for attaching HardieBacker or equivalent fiber cement backerboard to wood or light gauge steel studs. Backer-On's patented serrated head design countersinks for flush seating at any angle, providing a smooth surface for tile.