Using this Praxis Extendable Drill Bit System is easy. First, start with your base drill bit. Then, screw on the 18 - foot extensions one by one until you reach your desired length. When you're using it, make sure to apply even pressure to avoid damaging the bit. Also, don't use it for materials that it's not designed for. As for maintenance, after each use, clean the bit with a brush to remove any debris. If a part gets worn out, simply unscrew it and replace it with a new one. This way, you can keep your drill bit system in good working condition for a long time.