backer-on rock-on 23510 cement board screw, #9 thread, 1-5/8 in l, hi-lo thread, serrated head, star drive, sharp point

Backer-On® cement screws are designed for attaching HardieBacker® cement board and Rock-On® cement board screws are designed for attaching Durock® cement board to wood or light gauge steel studs. The patented serrated head design countersinks for a flush finish even at angle, providing a smooth surface for tile installation. The T25 star drive recess provides Stikfit™ for one handed installation. Climacoat corrosion-resistant finish prevents rust from bleeding into grout. Making it ideal for use in high-moisture areas such as bathrooms and kitchens. Backer-On® and Rock-On® cement board screws comply with ANSI standards for cement board installation as specified by cement board manufacturers. Cement board manufacturers require ANSI compliance in order to remain eligible for warranty.

• Serrated head - designed to drive flush even at an angle
• Star drive with T25 bit - provides Stikfit™ for easy one handed installation and eliminates cam outs
• Hi-lo/single threads - starts quickly and drives smooth in cement boards
• Sharp points - offers immediate pick-up and eliminates the need to pre-drill
• Climacoat finish - corrosion-resistant for preventing rust from bleeding into tile