Staples are strong and really good quality but self tapping screws are useless. Save yourself the headache and if you have a car that needs self tapping screws, just go to Ace and buy them. The ones in the pack are gold, which makes you think they're 8th grade, but they won't make it through the 2008 Expedition. I bought a class 5 self tapping screw the same size (5/16k) and it took less than 20 minutes to install with an air wrench.
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