There are plenty of mods that allow the conversion of gravel to flint without breaking and replacing the block until it drops flint (or requiring fortune to guarantee it), but as far as more recent Minecraft versions goes, there aren't many mods that do the inverse, if there are any at all.
That's where I come in. Now there's a mod that lets you condense all of your excess flint back into gravel. It's mostly for players using mods such as Ex Nihilo, where sifting gravel in higher-tier meshes can result in multiple stacks of flint as a byproduct. It can be used for other purposes as well, such as combining flint back together into gravel if you need gravel to craft, for example, concrete powder but you don't have access to silk touch quite yet.
...There's really not much else to say, it's pretty self-explanatory.