I just received one on my last order, and the picture does not do it justice, the hub is 11mm thick and the hole in the middle is 8mm it does come with several adapters to fit multiple shafts, this is one mean prop. easy to balance.
Using these with a 1200kv motor on my 32inch, 460 gram plane and am very much impressed with this combo. Nice climb out exellent speed and they don't break! I don't have wheels on my plane and they have survived the odd nose first touch down!