Nice looking pennies but not any value over face IMO! Not worth the investment to have graded unless I'm missing something that makes them special!!!
They do look like some fine specimens. Try looking online first at what they are selling for. May find a deal there relative to sending them out yourself. If not, you'll have to figure the cost/benefit angle out.
Check for CAM or WAMs on those dates. You have both Close AMs, I cant remember which one has the premium.
The 1999 is not a WAM normal and to me I just see two cents but very exceptional zilincolns if I were you just keep them.
You would need a MS69 to even be worth your time and money. There are too many plating issues to even think about an MS67.
"Should I grade them?" Why? Looks like you have them protected in plastic already. Hang on to them for 50 years and they may increase in value. JMO.
For a 1992 and 1992D look for a CAM. For the 1998, 1999, and 2000 look for a WAM. The OP's 1993 is not one of these dates and the 1999 has a Denver mint mark! The 1998, 1999, 2000 WAM's are all minted in Philadelphia and do not have a mint mark!
how you have them now is the best protection they could really have at the lowest cost, grading will likely cost you more than they are worth currently. but as the old saying goes "Zincolns aren't forever". because of the zinc and copper, they are a ticking time bomb in circulation and lucky to last 10 years out there in the wild, while the nice ones, protected, might last 100 years and then some, maybe forever. Maybe one day, really nice zincolns will shoot through the roof, when attrition runs it's course and they dissolve the billions and billions of them, meanwhile you have them in a confined space (smaller than a slabs void space even) protected from moisture and as much air ans humidity as possible, and dust. you never know if it becomes a condition rarity many years down the road. Don't let the orange peel look on the 1993D or the lines on the 1999 D discourage you either, both are "as struck" and still very much MS coins, both honest to goodness circulation strikes and not mint set extracts which are usually "smoother". I'd also say find coins like that condition, but from 2005-2010 from business strikes. the mint set coins are a different finish. that might be were the money is a few decades from now.
These coins have to “float on water” to be worth the grading fees. I see little marks, so the answer is no.
