Tapcon Hex Head Concrete Screw Anchor No inserts required. Drill a hole and drive an anchor. Replaces small diameter expansion anchors, plugs, and screws in light to medium duty applications. Reversible and removable. Thread design increases pullout values and lowers installation torque. Extra corrosion resistance. Can be installed close to the edge of concrete. Recommended for use in pressure treated lumber. Hex head. For installing 3/16 Tapcon fasteners, use 5/32 tapcon drill bit. For installing 1/4 Tapcon fasteners, use 3/16 Tapcon drill bit. Available in 8 and 75-piece box. Thread Diameter 1/4 In., Length 3-3/4 In., Head Type Hex, Material Steel, Finish Corrossion-Resistant Blue Climaseal, Pkg Qty 75, Package Type Box