I bought this set because my (used) car didn't come with a leg with a jack hook. I found this out when I had to change a tire and just had to jack the car up with the flat end of a wrench. I swore I wouldn't do it again. Thanks to this set I'm pretty close. With the jack halfway out, I found that the hook popped out when I turned the extension handle to the wrench! Totally out! I put it back in and tried hammering the end in to "squeeze" it harder, but it popped back out. In the end the open end of the extension had to be nailed to fit the jack. If you need this wrench set, just buy the wrench. If you need it for something else, just buy a new jack. A Big Red (or similar brand) bottle jack (twice the weight of your car) will probably cost no more than this set and will probably be a lot better than the original jack that came with your car. I did that and only my $0.02