Yes, you can use them for grape jelly. Snap the bails shut and put them in the water bath, that will give you your seal. In the old days, jelly was sealed by pouring melted wax on the top of the jar, no lid was used. This worked great except for mice chewing through the wax to get to the jelly. They could do this because the fruit was high acid, and the sugar added helped too. Get a good canning book that's new. I recommend either ther ball blue book or Jackie Clay's canning book. Jackies book can be found at backwoodshome.com. You can use old family canning recipes, you just need to check the newest processing times and methods before canning, better safe than sick.