Tapcon anchors are masonry screws designed with Advanced Threadform Technology which cuts threads into all masonry materials including concrete, block and brick. Many applications that include shelving brackets used in electrical equipment, HVAC strapping, 2x4 lumber, wood headers, window frames, jambs & sills, door frames to masonry, plywood backer boards to masonry and exterior installation into masonry. Approved for use in ACQ treated lumber.