Concrete Screws or “Tapcons” are great for screwing into concrete. Included masonry drill bit is 3/16″ size. Used to anchor signs, fixtures to concrete and block buildings. These Concrete Screws have received Product Control Notice of Acceptance (No. 15-0930.14) from the Miami-Dade Department of Regulatory and Economic Resources, certifying that they meet all Miami-Dade Requirements.