Re: what do you keel bolts look like?
There's keel bolts you can unscrew with a wrench, like the ones in Beneteaus that are only some inches long.
And then there's keel bolts, in general, which are long j-shaped rods permanently embedded in a lead keel. You can't unscrew a conventional keel bolt at all, you have to cut into the keel and cut off the "J" part to pull the rest of the shaft, unless it has heavily corroded.
If you've got the Beneteau kind, don't worry. They're meant to be removed and replaced one at a time if they get all funky. Don't like the look of them? Replace them. Grease the new ones so they stay rust-free.