Tapcon 3/16-inch x 3-1/4-inch Climaseal Blue Slotted Hex Head Concrete Screw Anchors With Drill Bit - 225 pcsOverview Model # 24570CH 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