Minerallac Tapcon Concrete Screw, Slotted Drive, 1/4 in Diameter, 1-3/4 in Overall Length, Hex Washer Head Drive, Steel, 3/16 x 3-1/2 in Drill, Blue Climaseal Coated, Applicable Materials: Concrete/Block/Brick, Patented Advance Threadform Thread, 0.187 in H x 0.308 in W Head