Using your Klein Tools power driver bit set is easy. First, select the appropriate bit for your task. If you're working with a Phillips - head screw, pick either the #1 or #2 Phillips bit. For square - drive screws, use the #1 or #2 square bit, and for slotted screws, the 13/16 - inch bit is your go - to. Insert the bit into your Klein Switch Drive handle or your power tool. Make sure it fits snugly. When using the tool, apply steady pressure to avoid slipping and damaging the screw or the surface. As for maintenance, after each use, wipe the bits clean with a dry cloth to remove any debris. Keep them in a dry place to prevent rusting. Avoid using the bits on materials that are too hard or brittle as it may damage the bits. With proper use and care, this Klein Tools bit set will serve you well for a long time.