Using these DAGGER-CON concrete screws is easy. First, make sure you have the right drill bit for the job. For attaching wood or metal to concrete, drill a pilot hole into the concrete. Then, simply insert the screw and use a #3 Phillips screwdriver to drive it in. Since the threads have deep cutting notches, it should require less effort. When using in thin-gauge metal or wood, the hi-low threads work great to hold everything in place. As for maintenance, the blue DAGGER-GUARD coating offers good corrosion resistance, but try to keep the screws away from extremely wet or corrosive environments if possible. If they do get dirty, you can gently wipe them clean with a dry cloth. Always store the screws in a dry place to maintain their quality.