Poor quality soft metal torx cap nuts. First, I screwed the existing pre-drilled holes into the car, and the torx bit in the ratchet slipped off, not immediately realizing it had actually dropped! Let me further explain that the top and bottom nuts on the jack must be adjusted at the same time, a few turns at a time. I decided to unscrew the other nut and return the kit. But to my dismay, the other head was also ripped off. Now I need to find a mechanic who knows how to get those nuts out! I definitely can't (I'm a 70-year-old autodidact, by the way). Obviously the strength of the metal is not at all comparable to the original GM part (if you buy those poorly made jacks keep and use the four original nuts). Finally, the supplied instructions are not intended for this type of lift!
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