Imagine my surprise when I unpacked the heads (individually in oiled bags) and put them back into the recesses in the plastic case (they wobbled in transit) and found two heads that were marked 32 mm. . But one seemed a little bigger than the other. So I measured them with a micrometer and indeed one was larger and there was no market for 33mm as it should have been. So my guess is that one of those sockets labeled 32mm is actually a mislabeled 33mm socket. So 4 stars.