Product review (4 stars): Cheep, but gets the job done.  My 2nd set is working like the first.
So obviously we bought these for our washing machine, to repair the agitator spindle.
The agitator dogs lasted about 4 years for us before they stopped working entirely.  They don't seem to be exact OEM replacements, as mentioned by others, but they do get the job done.
I must also say that our washer is old, and has some internal damage on the agitator spindle where the dogs catch.  Someone tried to repair it with screws or something and that messed up the teeth/catches on the spindle, which I'll say the damage there may be the culprit for why our last set of dogs broke down so quickly.

We just purchased a new set of dogs, and they've been working great for about 2 months now.  If you need a quick cheep fix, these certainly do it.  Not exactly sure how long they'll last, but I don't expect our washer to last another 4 years anyways..