Backer-On Rock-On 1-1/4 in. cement board screws are designed for attaching Hardie Backer or equivalent fiber cement backer board to wood or light gauge steel studs. Backer-On Rock-On's patented serrated head design countersinks for flush seating at any angle, providing a smooth surface for tile. The Star drive recess with T-25 bit provides Stikfit for 1-handed installation. Backer-On Rock-On screws feature a Climacoat corrosion-resistant finish that prevents rust from bleeding into the grout and are perfect for use in high-moisture areas such as baths, showers, countertops, and floors. Conforms to ANSI A108.11 for cement board attachment. Backer-On Rock-On screws can be installed with a standard impact or drill/driver and product) for cement board fastening done right.

• Brand Name: Backer-On
• Sub Brand: Rock-On
• Callout Size: No. 9
• Length: 1-1/4 in.
• Drive Style: Star
• Head Type: Flat Head
• Product Type: Cement Board Screws
• Number in Package: 185 pk
• Driver Bit Included: Yes
• Color: Green
• Indoor or Outdoor: Indoor
• Self Drilling: Yes
• Finish: Zinc-Plated
• Packaging Type: Clamshell
• Thread Type: Serrated
• Application: Multi-Purpose
• Material: Steel
• Self Tapping: Yes
• Drive Size: T25