Redesigned Tapcon concrete screw anchors are available with a star flat head and a hex head. The star-head recess eliminates bit slip during installation by providing six points of contact between the bit and the anchor. The hex-head screw anchors feature new ribs under the head that resist anchor spinouts and head snaps during installation, according to Tapcon. Both screws have a corrosion-resistant coating. The screws are available in 3/16- and 1/4-inch diameters and in lengths from 1 1/4 to 4 inches. Online, a 75-pack of 1/4-in. x 2 1/4-in. star flat-head anchors with bit runs about $22. tapcon.com