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Masonry screw anchors, or screw-in-anchors are self-tapping screws, fully removable fasteners designed to be used in masonry. They are drilled into an appropriately sized pilot hole wherein they create their undercut with their high and low threads. They can also be used to expand other anchors, such as drop in anchors, in fastening various materials in concrete, bricks, and blocks. Masonry screw anchors are available in various lengths and sizes.