Using these Klein 32483 replacement bits is easy. First, select the appropriate bit (#2 Phillips or 1/4 - Inch Slotted) for your task. Then, insert it into your 10 - in - 1, 11 - in - 1 or 10 - Fold™ screwdriver/nut driver. Make sure it fits snugly. When working, apply steady pressure to avoid slipping and causing damage. As for maintenance, after each use, wipe the bits clean with a dry cloth to remove any dirt or debris. Store them in a dry place to prevent rusting. If the bits start to show signs of wear, it's time to replace them to maintain optimal performance.