Manufactured for top performance in masonry-based applications, Tapper Concrete Screw Anchors are designed to fasten objects into concrete, brick, and block. Concrete screw anchors. Hex washer head. Use for window installations, interior hand rails, metal door frames, storm shutters, interior lighting fixtures, thresholds, or screened enclosure. 100-pieces per pack. Carbide bit included. Ceramic-coated. ACQ approved.