Using these DAGGER - CON concrete screws is easy. First, make sure you've chosen the right size for your project. They work well for attaching wood or thin - gauge metal to concrete. When driving the screw, the deep - cutting notches in the thread will help reduce the effort needed. Just use a #2 Phillips screwdriver. Remember, the flat head is designed to countersink into the material surface, so it sits flush. As for maintenance, these screws have a 1000 - hour salt - spray coating for corrosion resistance. But if you notice any signs of rust, you can clean the area gently with a soft cloth. Store them in a dry place to keep them in good condition.