<font color='#000080'>You can do the overhead with twin 7s if you're careful. Manifolded sets have even got a nice handle at the top for the drop!
I've seen an attempt with 12s which was very entertaining. He ended up kneeling on the floor with tanks above him asking for help. Show-off.
I go my bolts and nuts for about the same money. The CD set with mushroom nuts is £8 I think, but even hat's ridiculous for a few bits of 316.