Install cement board with confidence using GRK Backer-On screws. The patented serrated head design countersinks flush at any angle without mushrooming the board surface, creating a smooth base for tile. T-25 star drive eliminates cam-out for fast, one-handed installation.

• #9 x 1-1/4" star drive cement board screws
• Serrated head seats flush without mushrooming
• T-25 star drive prevents cam-out
• Climacoat corrosion-resistant finish
• Serrated threads require less torque
• Self-tapping for clean entry into cement board
• 185 screws per pack

Applications: Fasten HardieBacker, Durock, WonderBoard, and other cement boards to wood or steel framing in showers, backsplashes, countertops, and floors.