The ITW Contractor Fasteners 23400 is a Pack of 200 Backer-On 10 x 1-1/4-Inch Screws. Specifically designed and recommended for use with HARDIBACKER ® fiber-cement backerboard, Bathtub / Shower, Countertops Floors, Sink backsplash. Features: * 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 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. * Conforms with ANSI A108 for cement board attachment What"s In the Box: * ITW Contractor Fasteners 23400 Backer-On 10 x 1-1/4-Inch Screws 200-Pack