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  • 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.

  • Sure, I rounded one off shortly before posting the above and went and got yet another one from my box of accumulated drill bits.

    Stuck it in and it rounded off after using it to insert just 3 screws. Pretty sure it wasn't my technique at fault and just a cheap bit.

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