Dagger-Con Concrete screws are designed for light-duty concrete fastening. Holes must be predrilled with the proper size drill bit, which are also included in each 100 count packaged box. All of our industry standard "blue” long life Dagger-Guard coated concrete screws are also offered in bulk packaging without the bit. Whether the application calls for a Phillips Flat or Hex Washer Head, we have stock on all sizes. And, with a diamond point and notched threads, you can trust Dagger-Cons for all of your wood or metal to concrete, brick, cement block or masonry needs. For heavy duty concrete screw needs, look to the hex flange concrete screws which come in a 1/4” and 3/8” diameter in yellow zinc, long life Dagger-Guard Coating, and Dagger-Ceramic Coating for up to 2000 hour salt spray corrosion resistance and are available up to 7 inches in length. Both coatings are available in Bronze and White for common color match needs. Make Dagger-Con Concrete Screws your Choice today!