Cheap Philips bits are useless for impact. Good ones last a great deal longer, but still gradually wear - you can minimise this by paying attention to driver setting and the angle you hold it, to try and ensure the rattle you hear is the impact mechanism and not the bit turning in the screw.
Cheap Philips bits are useless for impact. Good ones last a great deal longer, but still gradually wear - you can minimise this by paying attention to driver setting and the angle you hold it, to try and ensure the rattle you hear is the impact mechanism and not the bit turning in the screw.