3/16" x 3-1/4" Concrete Screw, Phillips Flat Head - Bronze Dagger-Guard Coating, Pkg 1500Daggerz brand concrete screws are skillfully designed for wood or metal to concrete applications. This screw features a flat head that countersinks into the surface of the material. The Hi Low threads allow the screw to be used in either wood or thin gauge metal. It also features deep cutting notches in the thread that reduces driving torque. The proprietary Dagger Guard coating passes the 1000 hour salt spray test and provides excellent corrosion