It looks like a nifty little tool for working your musket but on reflection there are some things holding me back from praising it.
1) It isn't the triangular British style. Beyond not being correct for British army re-enactors the tool doesn't have any obvious way to attach a cord preventing it from getting lost and
2) at the small size I'd question how good a grip you can really get when cranking it tight to hold a flint in place.
3) the little hook on the end has it's uses but I just have the image of it punching a hole into the side of a canvass sack or pouch.