Manufactured with a large diameter head flange, Maxi-Set Tapcon brand Concrete anchors provide more surface area coverage to deliver maximum security along with 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 threads into Concrete, making it an excellent alternative to expansion anchors, plugs and lag shields. Use Maxi-Set Tapcon Concrete screw anchors for installing shutters, screened porches, pool enclosures and many other applications that require fastening into masonry.