ITW Buildex 10 x 1-1/4" Phillips Square Drive Backer-On Cement Board Sharp Point Screws, Carbon Steel (5000 per box)ITW Buildex Tek Screws Part # 2406000 Gimlet point starts easily in denser boards __ no pre drilling necessary. #2 square drive prevents bit from slipping. Special ribs under the head countersink into material for flush seating. Serrated thread design reduces installation torque and provides superior holding power. Corrosion resistant finish prevents unsightly rust from bleeding into tile. Gimlet point starts easily in denser boards __ no pre drilling