Backer-On 23405 Cement Board Screw, #10 Thread, Serrated Thread, Flat Head, Square Drive, Gimlet Point, Steel
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Designed for attaching fiber cement backerboard to wood or light gauge, 26 to 20, steel. No pre drilling necessary. #2 square drive prevent bit from slipping. For Bathtub/shower, countertops, floors, sink backsplash. Includes square drive bit.