The ITW Contractor Fasteners 23300 is a 200-Pack of Rock-On 9 x 1-1/4-Inch Hilo Screws Designed for attaching glass-mesh cement board to plywood, wood studs, or light gauge (26-20) steel, bathtub/shower, countertops, floors, or sink backsplashes. Features: * Type “S” point provides an easy start – no pre-drilling necessary * Wide wafer head for extra holding power in brittle material * Special ribs under the head countersink into material for flush seating * Deep HI-LO™ threads for maximum holding power * Exclusive Climacoat™ finish prevents unsightly rust from bleeding into tile * Conforms with ANSI A108 for cement board attachment What"s In the Box: * ITW Contractor Fasteners 23300 Rock-On 9 x 1-1/4-Inch Hilo Screws 200-Pack