Backer-On Rock-On 23505 Cement Board Screw, #9 Thread, 1-1/4 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.