Starborn's #9 x 1-5/8 in. Rock-On® S-12 Phillips Wafer-Head Hi-Lo-Thread Self-Drill Climacoat® Cement Screws are manufactured from hardened steel to resist breakage during high-torque installation. The Phillips drive allows smooth engagement with standard drivers, reducing cam-out and enhancing installation efficiency. Perfect for contractors and DIY professionals, these screws are well suited for securing cement boards, masonry anchors, and other heavy-duty substrates requiring precision fastening and long-term performance.