Tapcon 1/4-inch x 3-1/4-inch Climaseal Blue Flat Head T25 Concrete Screw Anchors With Drill Bit - 150 pcsOverview Model # 24590CT25 As the original Concrete screw anchor that revolutionized the construction world, Tapcon brand Concrete anchors deliver the ease of use, superior precision and the unparalleled performance that professionals demand. Tapcon Concrete screw anchors draw from its unique ability to TAP its own threads into Concrete, making it an excellent alternative to expansion anchors, plugs, and lag shields. Use Tapcon Concrete screw anchors