hexagonal shaft in a sentence

1. It is made of one piece of steel; the blade and a hexagonal shaft that is the handle.
2. The original design of the Ikkaku-ryk
   jutte had a hexagonal shaft cross-section with the tine attached to one of the corners instead of the flat surface.
3. An eccentric toothed gear is mounted on a hexagonal shaft . The wrench is introduced inside the pipe ( especially a close nipple, which has threading its entire length, and therefore no surface for an outside wrench ).
4. It's difficult to find hexagonal shaft in a sentence.