Using these Klein T8 and T15 tamperproof TORX® bits is easy. First, pick the right bit for your 4 - in - 1 electronics screwdriver. Simply insert the bit into the screwdriver. Then, use it to tighten or loosen screws in your electronic devices. When using, make sure to apply just the right amount of force. Too much force could damage the bit or the screw. For maintenance, after each use, wipe the bits clean with a dry cloth to remove any dust or debris. Store them in a dry place to prevent rusting. If you notice any signs of wear or damage, it's a good idea to replace the bits to keep getting the best performance.